PAPI Spares & Lifecycle Support
PAPI Lamp, Filter & Lens Spares for Airfield Ground Lighting
The correct optical component for the installed PAPI equipment
Correct replacement optical components maintain the intended optical configuration and operational performance of a PAPI system. Selection should be verified against the specific PAPI model, not physical dimensions or appearance alone.
Supplied by Precision AGL Solutions
Product Overview
PAPI Lamp, Filter & Lens Spares
What We Supply
Precision AGL Solutions supports identification and supply of PAPI lamps, filters, lenses and associated optical replacement components for maintenance, scheduled servicing, refurbishment and breakdown support.
PAPI optical components are equipment-specific. Verify optical characteristics, lamp type, electrical requirements, mechanical interface, beam configuration and the specific PAPI model before replacement. Correct selection helps maintain the intended red/white transition, beam geometry and optical output.
Replaceable Components May Include
- Lamps or light sources
- Optical and coloured filters
- Lenses and front optical elements
- Reflectors
- Lamp holders
- Optical retaining components
- Seals and gaskets
- Optical mounting hardware
Availability depends on the PAPI manufacturer, model, generation and optical design.
Identifying Replacement Components
We Can Work From
PAPI manufacturer & modelEquipment series and revision.
Equipment serial numberNameplate information.
Component markingsLamp, filter and lens identification.
Drawings & spare-parts listsManuals and component drawings.
PhotographsNameplate and optical assembly.
Procurement recordsPrevious purchase references.
Applications
Where PAPI Optical Spares Are Used
Preventive maintenancePlanned replacement per manufacturer recommendations.
Scheduled replacementPlanned refurbishment and lifecycle maintenance.
PAPI refurbishmentRestoring older units to their intended configuration.
Breakdown supportRestoring equipment after component failure or damage.
Visual-aid maintenanceOngoing runway visual-aid maintenance programs.
Spare-parts stockingCritical spares for reduced downtime.
PAPI Lamp Replacement
An Optical Maintenance Activity
Selection should consider the complete electrical, mechanical and optical requirements of the equipment.
Parameters to Consider
- Lamp technology
- Rated voltage, power and current
- Base or socket type
- Physical dimensions
- Filament / light-source position
- Luminous and colour characteristics
- Optical positioning
- Manufacturer and PAPI model compatibility
Similar Ratings Are Not Enough
A lamp with similar electrical ratings is not necessarily acceptable if its physical light-source position or optical characteristics differ from the original specification.
Lamp Compatibility
Information to Confirm Before Supply
Equipment
- PAPI manufacturer
- PAPI model
- Lamp marking — record everything printed or engraved
Electrical & Mechanical
- Voltage, power, current
- Supply configuration
- Base type and socket configuration
- Overall dimensions
- Lamp orientation and mounting arrangement
Optical Position
The light-emitting element must occupy the intended position within the optical assembly. Incorrect positioning can affect the optical output and beam characteristics.
PAPI Filters
Establishing the Intended Optical Characteristics
Selection Should Consider
- Filter type
- Optical transmission
- Colour characteristics and spectral response
- Dimensions, thickness and shape
- Mounting arrangement and orientation
- PAPI model
- Optical assembly configuration
Appearance Is Not Compatibility
A visually similar filter is not automatically an acceptable replacement. Depending on the PAPI design, filters establish or control the intended optical characteristics of the beam.
Red / White Optical Characteristics
Replacement Parts Must Preserve the Configuration
How the Indication Works
The PAPI indication depends on the relationship between the white and red portions of the emitted light. The assembly is designed so the observer sees different colour indications according to the aircraft's position relative to the visual approach path.
Changes That May Affect Distribution or Transition
- Filter characteristics
- Lens geometry
- Lamp position
- Optical alignment
- Reflector position
- Optical component thickness
Select components against the applicable PAPI equipment documentation. ICAO Annex 14 requires the red-to-white transition, seen from not less than 300 m, to occur within an angle of not more than three minutes of arc. A wrong filter, lens or lamp position can widen it.
PAPI Lenses
Precision Optical Components
Possible Lens Characteristics
- Lens geometry
- Focal characteristics
- Diameter or aperture
- Thickness and material
- Surface finish
- Optical transmission
- Mounting interface
- Retaining arrangement
Lens Damage and Inspection
- Cracking, chipping, scratching
- Clouding and discolouration
- Surface contamination
- Heat damage and deformation
- Moisture ingress
- Loose mounting
Severe contamination or degradation can affect performance even where the lens is intact. Follow the manufacturer maintenance procedure for cleaning and replacement.
Optical Component Identification
Collect as Much Information as Possible Before Ordering
Equipment
- PAPI manufacturer
- Model and serial number
- Revision or generation
Lamp
- Manufacturer and part number
- Voltage and wattage
- Base type
- Markings
Filter
- Part number
- Colour designation
- Dimensions
- Manufacturer marking
Lens
- Part number
- Dimensions and shape
- Manufacturer marking
Existing Assembly
- Photographs and equipment drawings
- Spare-parts list and maintenance manual
- Previous purchase reference
This information substantially improves the probability of selecting the correct component.
Technical Data
Equipment-Specific Parameters
Confirm exact lamp ratings, optical characteristics, dimensions and part numbers against the PAPI manufacturer's documentation before procurement.
| Parameter | Specification / Information |
|---|---|
| Product category | PAPI optical replacement spares |
| Components | Lamps, filters, lenses and associated optical parts |
| Application | PAPI maintenance and refurbishment |
| PAPI compatibility | Model-specific |
| Lamp type / voltage / power / base | Equipment-specific |
| Light-source position | Equipment-specific |
| Filter type / colour / dimensions | Equipment-specific |
| Lens type / geometry / dimensions | Equipment-specific |
| Optical transmission | Component-specific |
| Mechanical interface | Equipment-specific |
| Operating environment | Outdoor airfield environment |
| Replacement method | According to equipment maintenance procedure |
| Part identification | Manufacturer / model / part-number based |
| Documentation | Datasheet, drawing or compatibility information where available |
Spare-Part Compatibility
Establish It at Equipment Level, Not Component Level
Particularly important for older systems, where components from different equipment generations may look similar but differ optically or electrically.
- PAPI manufacturer
- PAPI model
- Equipment revision
- Existing optical assembly
- Original component part number
- Mechanical dimensions
- Electrical characteristics
- Optical characteristics
- Installation orientation
- Manufacturer's approved replacement information
Replacement Procedure
A Typical Optical-Component Replacement Process
- Identify the PAPI unit — manufacturer, model, serial
- Identify the component — all lamp, filter or lens markings
- Review documentation — drawings, manuals, spare-parts lists
- Confirm compatibility — against the original requirements
- Isolate the equipment — de-energise the circuit at the regulator under lock-out / tag-out, and never open an energised series circuit (Style B / current-powered units); for voltage-powered (Style A) units, isolate the supply feeding the unit; also per airfield electrical and maintenance safety procedure
- Remove the existing component — without damaging adjacent parts
- Inspect the assembly — holders, seals, reflectors, wiring
- Install the replacement — specified orientation and position
- Clean and secure — clean optical surfaces, retaining parts fitted
- Functional verification — per maintenance / commissioning procedure
- Verify alignment where required — if beam geometry or aiming may be affected, confirm the setting angles and the red/white transition before return to service, and arrange a flight check where the authority requires it
- Record the replacement — component, equipment ID and activity
Replacement Considerations
Lamps, Filters and Lenses
Lamp
Treat as an optical maintenance activity. Where a unit uses more than one lamp, replace them as a matched set. Where the unit is LED-based, the light engine may be replaced as a module instead of a lamp. Potential issues:
- Incorrect voltage, wattage or base
- Incorrect dimensions
- Incorrect light-source position
- Incorrect optical output
- Incompatible lamp technology
- Poor seating in the holder
- Contamination of optical surfaces
The manufacturer's approved procedure takes precedence over a generic method.
Filter
Handle carefully to prevent:
- Scratches
- Finger contamination
- Incorrect orientation
- Improper seating
- Optical distortion
- Damage to retaining components
Install in the defined orientation or mounting direction.
Lens
Confirm both mechanical and optical compatibility. Before installation, inspect:
- Lens surface
- Retaining ring and gasket
- Mounting seat
- Adjacent optical components
- Fasteners and sealing surfaces
After installation, verify correct seating with no mechanical stress.
Refurbishment Applications
Scope Established After Inspection
A Package Can Include
- Lamps, filters and lenses
- Lamp holders
- Reflector components
- Seals and gaskets
- Optical retaining hardware
- Electrical components
- Mounting hardware
Older Systems
The exact scope should follow an inspection of the installed equipment. For older systems, a complete component-compatibility review may be preferable to ordering individual parts based on appearance.
Breakdown Support
Identify the Fault Before Substituting Parts
Possible Symptoms
- Lamp failure
- Reduced optical output
- Uneven brightness
- Abnormal colour indication
- Damaged lens or cracked filter
- Moisture inside the optical assembly
- Intermittent operation
- Optical contamination
Approach
Compare the observed symptom with the manufacturer's troubleshooting procedure before replacing components.
Spare-Parts Stocking
Critical PAPI Optical Spares
Stocking Depends On
- Number of installed PAPI units
- PAPI equipment model and age
- Lamp replacement frequency
- Availability of replacement parts
- Airport operational requirements
- Manufacturer lead times
- Planned maintenance schedule
Potential Stock Items
- Replacement lamps
- Filters and lenses
- Lamp holders
- Seals
- Optical retaining components
- Other model-specific service parts
A site-specific list can be developed from the installed PAPI equipment inventory.
Storage & Handling
Appropriate to Their Construction
Follow any manufacturer storage temperature, humidity or packaging requirements.
Lamps
Protect from impact, contamination and excessive mechanical shock.
Filters
Protect optical surfaces from scratching and contamination.
Lenses
Store in protective packaging; avoid contact with optical surfaces.
General
Maintain identification labels so model-specific parts are not mixed.
Maintenance Inspection Checklist
During Scheduled PAPI Maintenance
Optical & Mechanical
- Lamp condition and markings
- Lamp holder condition
- Filter and lens condition
- Optical cleanliness
- Reflector condition
- Seals and gaskets
- Moisture ingress
- Mechanical retention
Electrical & Overall
- Electrical connections
- PAPI housing condition
- Alignment condition
- Document each replacement against the relevant PAPI unit
Common Replacement Problems
Causes and Recommended Actions
| Problem | Possible Causes | Recommended Action |
|---|---|---|
| Replacement lamp does not fit | Incorrect base; incorrect lamp model; different equipment generation; incorrect dimensions | Verify the PAPI model and original lamp part number |
| Lamp fits but optical performance is incorrect | Incorrect lamp type; incorrect light-source position; incorrect power rating; incompatible optical characteristics | Confirm against the manufacturer's approved lamp specification |
| Filter has correct dimensions but different appearance | Physical similarity alone is insufficient | Confirm the optical specification and PAPI model compatibility |
| Lens fits mechanically but does not match the optical assembly | Different lens geometry; different focal characteristics; different equipment generation; incorrect component | Confirm the lens part number and optical assembly configuration |
| PAPI requires alignment after replacement | Replacement may affect the optical assembly depending on design and procedure | Follow the manufacturer's post-maintenance inspection and alignment-verification requirements |
Quality & Traceability
For Critical Airfield Spare Parts
Procurement Documentation May Include
- Manufacturer and part number
- Equipment compatibility
- Batch or serial information
- Datasheet and technical drawing
- Certificate or conformity documentation where applicable
- Replacement instructions
Requirements
Establish traceability requirements according to the airport operator's procurement and maintenance procedures.
Standards & References
Select With the Complete PAPI System in Mind
Relevant References
- Applicable PAPI equipment standards
- Airport visual-aid requirements
- FAA AC 150/5345-28H (PAPI systems) and AC 150/5340-26C (maintenance of airport visual aid facilities), where applicable
- ICAO Annex 14 Vol. I (PAPI and APAPI colour, beam and transition requirements), where applicable
- National civil aviation authority requirements
- Airport engineering specifications
- PAPI manufacturer's installation and maintenance documentation
- Approved equipment drawings and spare-parts lists
Applying Them
Verify the applicable edition and project-specific requirements before procurement.
A replacement lamp, filter or lens should not be represented as compliant solely because it physically fits an existing PAPI assembly. Optical parts not specified by the manufacturer can also invalidate the equipment's type certification (for FAA-listed PAPI, see AC 150/5345-53D).
Documentation for Compatibility Review
Where Available, We Can Work From
For older or unidentified equipment, nameplate and optical-assembly photographs are particularly useful.
PAPI datasheets & manualsEquipment documentation.
Spare-parts listsComponent schedules.
Component drawingsDimensional drawings.
Part numbersExisting component identification.
Equipment nameplatesPhotographs of nameplate and optical assembly.
Procurement recordsPrevious purchases.
Precision AGL Solutions Support
PAPI Lifecycle Requirements
We Support
- Spare-part identification
- Replacement lamp, filter and lens selection
- Optical-component compatibility checks
- Planned maintenance spares
- Refurbishment requirements
- Breakdown replacement
- Legacy equipment support
- Replacement-part documentation
- PAPI maintenance equipment coordination
The Objective
To identify the correct replacement component for the installed equipment rather than supplying a generic component based only on physical similarity.
FAQ
PAPI Lamp, Filter & Lens Spares — Frequently Asked Questions
What PAPI optical spares are available?
Replaceable components may include lamps or light sources, optical and coloured filters, lenses and front optical elements, reflectors, lamp holders, optical retaining components, seals and gaskets, and optical mounting hardware. Availability depends on the PAPI manufacturer, model, generation and optical design.
Can I use a lamp with the same electrical ratings as the original?
Not necessarily. A lamp with similar electrical ratings is not acceptable if its physical light-source position or optical characteristics differ from the original specification. Consider lamp technology, rated voltage, power and current, base or socket type, dimensions, filament or light-source position, luminous and colour characteristics, and manufacturer and PAPI model compatibility.
Is a filter that looks the same acceptable as a replacement?
No. A visually similar filter is not automatically acceptable, because depending on the PAPI design the filters establish or control the intended optical characteristics of the beam. Selection should consider filter type, optical transmission, colour characteristics, dimensions and thickness, mounting orientation and the PAPI model.
Why do replacement optical parts affect the red/white transition?
The indication depends on the relationship between the white and red portions of the emitted light, so filter characteristics, lens geometry, lamp position, optical alignment, reflector position and component thickness can all affect distribution or transition. ICAO Annex 14 requires the red-to-white transition, seen from not less than 300 m, to occur within an angle of not more than three minutes of arc, and a wrong filter, lens or lamp position can widen it.
What information is needed to identify the correct replacement part?
Provide the PAPI manufacturer, model and serial number, revision or generation, and the lamp, filter and lens part numbers, voltage and wattage, base type, colour designation, dimensions and markings. Photographs of the nameplate and optical assembly, drawings, the spare-parts list or maintenance manual and previous purchase references also help, and for older or unidentified equipment nameplate and optical-assembly photographs are particularly useful.
Are PAPI optical components interchangeable between manufacturers or models?
Not necessarily. Compatibility should be established at equipment level, not component level, especially for older systems where parts from different generations can look similar but differ optically or electrically. A replacement should not be represented as compliant solely because it physically fits, and optical parts not specified by the manufacturer can invalidate the equipment's type certification (for FAA-listed PAPI, see AC 150/5345-53D).
How should the circuit be isolated before replacing a PAPI lamp, filter or lens?
De-energise the circuit at the regulator under lock-out / tag-out, and never open an energised series circuit (Style B, current-powered units). For voltage-powered (Style A) units, isolate the supply feeding the unit. Also follow the airfield electrical and maintenance safety procedure, and the manufacturer's approved procedure takes precedence over a generic method.
Does a PAPI need re-alignment after replacing an optical component?
It can, depending on the design and procedure. If beam geometry or aiming may be affected, confirm the setting angles and the red/white transition before return to service, follow the manufacturer's post-maintenance alignment-verification requirements, and arrange a flight check where the authority requires it.
Should PAPI lamps be replaced individually?
Where a unit uses more than one lamp, replace them as a matched set. Where the unit is LED-based, the light engine may be replaced as a module instead of a lamp. Check for the correct voltage, wattage and base, dimensions, light-source position, optical output and lamp technology, and seat the lamp properly in the holder.
What are the common problems with replacement parts?
Typical problems are a lamp that does not fit (incorrect base, model, equipment generation or dimensions), a lamp that fits but gives incorrect optical performance, a filter with correct dimensions but different appearance, and a lens that fits mechanically but does not match the optical assembly. Identify the fault before substituting parts by comparing the symptom with the manufacturer's troubleshooting procedure, rather than replacing components first.
Which PAPI optical spares should be stocked?
Stocking depends on the number of installed PAPI units, equipment model and age, lamp replacement frequency, availability of parts, operational requirements, manufacturer lead times and the planned maintenance schedule. Potential stock items are replacement lamps, filters and lenses, lamp holders, seals, optical retaining components and other model-specific service parts. Keep identification labels so model-specific parts are not mixed, and protect optical surfaces from impact, scratching and contamination in storage.
Procurement Information for Indian Projects
Indian public tenders commonly ask for the documents below. State which ones your tender requires when you send the enquiry, so they are covered in the quotation.
- Manufacturer / OEM authorisation
- Country of origin and local-content declaration (for Make in India purchase preference)
- Type-test and routine-test certificates, and the FAA / ICAO / IEC compliance documents named in the specification
- Datasheets, drawings and installation instructions
- Warranty, delivery period and spares support
- GeM catalogue or tender-portal requirements, where applicable
Request PAPI Spare-Part Compatibility Checking
If you require replacement PAPI lamps, filters, lenses or other optical components, provide the existing PAPI manufacturer, model number, serial number or component part number where available. Photographs of the PAPI nameplate, optical assembly and existing component markings can also assist with identification. Precision AGL Solutions can support compatibility checking for maintenance, refurbishment, planned spare-parts stocking and breakdown replacement.
- Emailprecisionaglsolutions@gmail.com
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Engineering Note
PAPI optical components are not necessarily interchangeable between manufacturers, models or equipment generations. Lamp electrical characteristics, light-source position, filter transmission characteristics and lens geometry can all affect the optical performance of the complete PAPI assembly.
Verify replacement components against the applicable manufacturer's documentation and approved equipment configuration before installation. Exact part numbers, lamp ratings, optical characteristics, dimensions and compatibility should be confirmed from the current equipment documentation and component datasheet before procurement.
Product Disclaimer
Product availability, configuration, dimensions, electrical characteristics, photometric performance, certifications and compliance status depend on the selected manufacturer and project specification. The technical values published on this page should not be treated as a substitute for the manufacturer's current approved Technical Data Sheet.
Final selection shall be based on the approved project specification, applicable aviation standards, authority requirements, manufacturer documentation and site conditions. Use of this page is also subject to the Legal Notice, Disclaimer & Terms of Use.
Standards and editions referenced on this site are listed on the Standards Reference page.