PAPI Precision Approach Path Indicators | ZA757 & ZA737
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Ordering Codes
A 4-LHA installation. Four legs equipped with frangible floor flanges provide extra stability.
PAPI: From the Pilot's View
The PAPI projects a distortion free beam of uniform intensity over ten degrees of azimuth and is effective to within 1000 ft. of touchdown.
A wireless remote control system obviates the need for long runs of control wire to distant PAPIs. Where control wire must circle runways or control several devices, a radio modem remote system is a very cost effective alternative. Call for details.
The PAPI light housing assembly (LHA) is supported by 2" EMT legs (not included). Flexible, water tight conduit and wiring (48"), frangible floor flanges and mounting hardware are provided. L867 bases and baseplates are sold separately.
The power adapter is mounted on 2" EMT legs (not supplied) or wall mounted. A photoelectric control sensor adjusts the PAPI's brightness in response to ambient light conditions. Frangible floor flanges are included.
The CHAPI Heliport System: The CHAPI system is similar to the two-unit PAPI but with a filter inserted between the white and red filters of each lens to provide a 2° wide green sector that, when visible from both units, signals the proper glide slope angle of 6°. Angle deviations that are too high show one or two white lights, and those that are too low show one or two red lights.
Read the Right Glide Slope From Over Ten Miles Out!
The precision approach path indicator (PAPI) provides the pilot with a safe and accurate glide slope on final approach to the runway. A row of PAPI light housing assemblies (LHAs) placed perpendicular to the approach path are seen by the pilot in combinations of red and white to indicate a path that is too high, too low or correctly on slope.
Configuration Options
The four-box PAPI system consists of four LHAs that use either 2 lamps (ZA757) or 3 lamps (ZA737). The 3 lamp configuration permits normal operation with one lamp out.
The two-box PAPI system uses only two LHAs and provides simplified glide slope information. The PAPI can be configured to read white/green/red for use on heliports.
Power Options
Three energy styles are available:
Style A operates from a 240VAC (120V is also available), single phase, 60 Hz power supply. 120V and 50Hz are also available.
Style B is current powered and operates on 6.6 amp series circuits from an L828 constant current regulator. Lamp brightness is controlled by the output setting on the regulator.
Style C is a 48V system powered by auto batteries. This style is of particular value on remote airstrips where it would be uneconomical to bring in power lines.
Operating Conditions
PAPIs are manufactured to meet two temperature standards: Class I for normal operation to as low as -35° C, and Class II, with lens heaters, for temperatures to -55° C.
Photometrics
Flight Light PAPIs have the most reliable photometrics in the industry. On a normal day a 2-lamp PAPI unit is visible from over 10 miles out. Light distribution curves far exceed FAA requirements.
For FAA style units, a tilt-switch in each PAPI shuts down the entire system if any unit becomes misaligned.
Optional Aiming Device
Lamps are adjusted to the correct glide slope angle (± 3′ of arc) by means of an optional aiming device kit equipped with a spirit level. The level is also used to adjust the tilt switch that is standard with both models.
Interlock Relay Option
The interlock relay option operates PAPI in conjunction with runway lights.
Features
Performance Advantages
• Outstanding photometric performance. Pilots say they see this PAPI before they see any competing brand.
• Four-leg design makes each light housing assembly very stable, resulting in fewer shut-downs for realignment thereby reducing maintenance and increasing airfield utilization. (EMT legs not included with domestic orders.)
• LED indicator identifies tilt switch circuit fault.
• Quartz halogen average rated lamp life is 1200 hours! Competitor’s lamps rated at only 1000 hours.
Maintenance Advantages
• Dust proof LHA is standard. Enhances lamp life, improves photometric performance and reduces maintenance cost.
• No optical bench or special tools required for servicing. Special access doors speed lamp changes in the field.
• Off-the-shelf lamps reduce life-cycle costs.
• Circuit breaker and on/off switch in power adapter (Style A) and in each LHA (Style B) protect equipment at all times.
• Extremely reliable power adapter features WAGO terminal blocks, gas-tight ferrelled connections and Teflon wire.
Options
• Custom configured remote control uses radio modems instead of hard wiring to control PAPIs.
• Aiming device simplifies setting tilt switch and azimuth angles.
• Interlock relay to operate PAPI in conjunction with runway lights.
• CHAPI heliport system
• ICAO version (no tilt switch)
• International packing – four 2″ EMT legs per LHA with all units and hardware double boxed.
Features and Characteristics
• Fully gasketed dust proof light housing assembly (LHA) improves performance and reduces maintenance (standard feature).
• Large lens overhang and optional heaters forward of the lenses allow continuous operation under severe arctic conditions.
• Input power:
4-Box PAPI 1,800 VA
2-Box PAPI 1,000 VA
• Standard input voltage: 240 VAC, ±10%
• Lamps: 200 watts, 6.6 amp quartz halogen
• Rated lamp life: 1,200 hours
• Environmental operating conditions:
Class I: +55° to -35° C (+131° to -31° F)
Class II: +55° to -55° C (+131° to -67° F).
Humidity: 0% to 100%
Wind: 100 mph (161 km/hr).
• Easy to maintain and relamp.
Common Renewal Parts
| Part Number | Part Description |
|---|---|
| LA-6373 | Lamps: 200 W 6.6A quartz |
| 15-FFF2X425 | Frangible cast aluminum floor flange |
| 15-201TSA | Tilt switch assembly |
| 77-104FAANTD | Photo control 208-277 VAC |
| 15-CHAPIFILTERASSY | CHAPI filter assembly (white/green/red) |
| 80-021253 | Filter spring |
| 80-021254 | Reflector assembly |
| 77-RH25.47 | Resistor – 25 W, 0.47 ohm (lens heater Class 2 only) |
| 77-W199AX-15 | Relay, contactor – 30 amp DPDT, 240 VAC |
| 77-777-310 | Tool for WAGO terminal blocks |
| 77-RTE-P21 | Timer, D-O-B adjustable – 24 VAC/DC |
| 77-TB20199 | Photo control base |
| 77-#98-6 | Precision spirit level, 6″ |
Packing Specifications
| Description | ZA757 | ZA737 |
|---|---|---|
| Number of lamps | 2 | 3 |
| Net weight in lb. | 42 | 55 |
| Gross weight in lb. | 53 | 75 |
| Length in inches | 48 | 48 |
| Width in inches | 22 | 32 |
| Height in inches | 15 | 15 |
| Volume in cubic yd. | 0.34 | 0.50 |
| Lamp | 2x200W/6.6A | 3x200W/6.6A |
| Type | LA-6373 | LA-6373 |
| Transformer | 2x200W/6.6A | 3x200W/6.6A |
PAPI Wiring Connections
Tilt Switch Circuit
Powering LHA 1
Powering LHA 2
Interruptor de inclinacion (Español)
Alimentacion de la caja LHA 1 (Español)
Alimentacion de la caja LHA 2 (Español)
PAPI Troubleshooting
Tilt Switch Circuit
LHA Alignment
PAPI (Style A) Troubleshooting
Very few problems will occur with your system. However, in the case of problems, the following pointers will help you locate and correct the problems. It is assumed that all interconnect wiring is good and that tilt switches are aligned and have continuity. Also, verify 50 or 60Hz power source for operation.
| Symptom | Likely Problem |
|---|---|
| CLASS I or CLASS II | |
| Lamp ‘OUT’ | Check lamp (if either lamp burns out, it would not shut off the other lamp). |
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| PEC operation reversed (dim in daylight) |
Check wiring of PEC to TB3 (color coded red/blk/wht). |
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| CLASS II ONLY! | |
| Lamp still not ‘ON’ | Temporarily short TB1B, R1-1 and R1-2, then R2-1 and R2-2. As each is tested, if the failed lamp turns ‘ON’, the heater resistor may have failed. Check for .5 ohm resistance – replace if required. |
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| CLASS I or CLASS II | |
| Lamps do not burn (RTE-P21 mode light out) |
Temporarily short Power Supply TB1 T-1 and TB1 T-2 and engage CB1. If system now functions, problem is either switches or tilt switch wiring. If problem is determined to be a particular tilt switch, readjust tilt switch by going through zero and then back. DO NOT LEAVE JUMPER IN PLACE! |
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| Light Box Alignment | Footers not stable. Mounting hardware is not tight. Check floor flanges, nuts on frangible couplings, bolts & nuts on light box. |
PAPI (Style B) Troubleshooting
Very few problems will occur with your system. However, in the case of problems, the following pointers will help you locate and correct the problems. It is assumed that all interconnect wiring is good and that tilt switches are aligned and have continuity.
| Symptom | Likely Problem |
|---|---|
| CLASS I or CLASS II | |
| Lamp ‘OUT’ | Check lamp (if either lamp burns out, it would not shut off the other lamp). |
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| CLASS II ONLY! | |
| Lamp still not ‘ON’ | Temporarily short TB1B, R1-1 and R1-2, then R2-1 and R2-2. As each is tested, if the failed lamp turns ‘ON’, the heater resistor may have failed. Check for .5 ohm resistance – replace if required. |
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| CLASS I or CLASS II | |
| All lamps will not turn ‘ON’ | L-880 System (four [4] box): Temporarily short TB1A, T-1 and T-2 on the MASTER unit. Only its lamps should be ‘ON’. If not, check continuity of tilt switch. If OK, replace the MASTER control board. If the MASTER is OK, repeat the procedure on each SLAVE unit. If lamps energize in all OTHER units, replace THAT SLAVE control board. If problem is determined to be a particular tilt switch, readjust tilt switch by going through zero and then back. DO NOT LEAVE JUMPER IN PLACE! |
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| Light Box Alignment | Footers not stable. Mounting hardware is not tight. Check floor flanges, nuts on frangible couplings, bolts & nuts on light box. |
PAPI (Style A) – Battery Supply (no tilt switch) Troubleshooting
Very few problems will occur with your system. However, in the case of problems, the following pointers will help you locate and correct the problems. It is assumed that all interconnect wiring is good.
| Symptom | Likely Problem |
|---|---|
| Lamp ‘OUT’ | Check lamp (if either lamp burns out, it would not shut off the other lamp). |
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| Lamp still not ‘ON’ | Temporarily short TB1B, R1-1 and R1-2, then R2-1 and R2-2. As each is tested, if the failed lamp turns ‘ON’, the heater resistors may have failed. Check for .5 ohm (each) resistance – replace if required. |
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| Lamps will not come on | Check for a supply of +36 VDC on Circuit Breaker #1 and for +24 VDC on Circuit Breaker #2. Both should be present. If not, check battery supply. Check continuity of the Contractor Relay’s (CR1) coil. It should indicate approx. 280 ohms. Check for continuity of Push Button Switch (SW1) when depressed. If all of the above indicate OK, replace the RTE-P11 timer. |
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| Light Box Alignment | Footers not stable. Mounting hardware is not tight. Check floor flanges, nuts on frangible couplings, bolts & nuts on light box. |
PAPI (Tipo B) Corrección de Fallos
Muy pocos problemas surgiran con su sistema. Sin embargo, en caso de problemas, los siguientes pasos le ayudará en ubicar y correjir los problemas; suponiendo que todo los cables de interconexión esten bien y que los interruptores inclinados esten alineados y tengan continuidad.
| Síntoma | Problema Probable |
|---|---|
| CLASE I o CLASE II | |
| Lámpara ‘fundida’ | Inspeccione la lámpara (si una de las lámparas se funde, no apagara la otra lámpara). |
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| CLASE II SOLAMENTE | |
| Lámpara todavía no se enciende | Cause un corto temporal en el TB1B, R1-1 y el R1-2, después en el R2-1 y en el R2-2. Mientras cada uno este siendo examinado, si la lámpara que falla se enciende, el resistor del calentador debe haber fallado. Compruebe resistencia de .5 (ohm) – reemplace si es necesario. |
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| CLASE I o CLASE II | |
| Todas las lámparas no se encienden | Sistema L-880 (de 4 unidades): Cause un corto temporal en el TB1A, T-1 y en el T-2 en la unidad principal. Solo sus lámparas deben estar encendidas. Si no es el caso, reemplace la tabla principal de control. Si la tabla principal esta bien, repita el procedimiento en cada unidad esclava. Si las lámparas se prenden en todas las otras unidades, reemplace esa tabla de control esclava. Sistema L-881 (de 2 unidades): Cause un corto temporal en el TB1A, T-1 y en el T-2 en la unidad principal. Solo sus lámparas deben estar encendidas. Si no es el caso, reemplace la tabla de control principal. No es necesario hacer más pruebas; reemplace la tabla de control esclava. NO DEJE LOS CABLES CONECTADOS |
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| Alineación de unidad de iluminación | Las bases no estan estables. La herramienta de montar no esta sujeta. Examine los flanges del suelo, las tuercas en los enganches frangibles, los cerrojos y las tuercas en la unidad de iluminación. |
Ordering Codes
A 4-LHA installation. Four legs equipped with frangible floor flanges provide extra stability.
PAPI: From the Pilot's View
The PAPI projects a distortion free beam of uniform intensity over ten degrees of azimuth and is effective to within 1000 ft. of touchdown.
A wireless remote control system obviates the need for long runs of control wire to distant PAPIs. Where control wire must circle runways or control several devices, a radio modem remote system is a very cost effective alternative. Call for details.
The PAPI light housing assembly (LHA) is supported by 2" EMT legs (not included). Flexible, water tight conduit and wiring (48"), frangible floor flanges and mounting hardware are provided. L867 bases and baseplates are sold separately.
The power adapter is mounted on 2" EMT legs (not supplied) or wall mounted. A photoelectric control sensor adjusts the PAPI's brightness in response to ambient light conditions. Frangible floor flanges are included.
The CHAPI Heliport System: The CHAPI system is similar to the two-unit PAPI but with a filter inserted between the white and red filters of each lens to provide a 2° wide green sector that, when visible from both units, signals the proper glide slope angle of 6°. Angle deviations that are too high show one or two white lights, and those that are too low show one or two red lights.
