PAPI Precision Approach Path Indicators | ZA757 & ZA737

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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.

PAPI light distribution

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
80-019035 Filter glass, red - ZA757/4
80-021253 Filter spring - ZA757/4
80-021254 Reflector assembly - ZA757/4
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).

PEC operation reversed
(dim in daylight)
Check wiring of PEC to TB3 (color coded red/blk/wht).

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.

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!

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).

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.

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!

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).

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.

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.

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).

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.

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

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.

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