GROUND PROXIMITY WARNING SYSTEM - ADJUSTMENT/TEST
1. Test Ground Proximity Warning System
A. Equipment and Materials
(1)
Pitot static test set with hoses and adapters adequate for connection to pitot static system (Ref 34-11-0, Adjustment/Test)
(2)
Radio altimeter test set (simulator)
(3)
Signal Generator - IFR NAV 401L (VOR/ILS test set)
(4)
Stop watch
B. Prepare to Test
(1)
Verify that GND PROXIMITY WARN AC, RADIO ALTM-1, CAPT ALTM (26 VAC), AIR DATA CMPTR-1, and VHF NAV-1 (VOR/ILS and G/S) circuit breakers on panel P18 are closed.
(2)
Verify that DIM & TEST and INDICATOR LIGHTS circuit breakers on panel P6 are closed.
(3)
Provide electrical power.
(4)
Verify that failure flags on captain's and first officer's radio altimeter indicators are not in view, and altitude pointers indicate 0 to -10 feet.
(5)
Verify that captain's and first officer's PULL UP and BELOW G/S indicators are off.
(6)
On first officer's instrument panel, verify that GROUND PROXIMITY INOP indicator light is off, and that FLAP (FLAP/GEAR) INHIBIT switch is set at NORMAL position.
(7)
Install ground lock pins in landing gear. The landing gear hydraulic systems must be off.
WARNING: THIS MUST BE ACCOMPLISHED BEFORE OPERATING LANDING GEAR LEVER.
(8)
Activate electrical drive for flap system (Ref Chapter 27).
WARNING: ENSURE THAT NO PERSONNEL ARE WORKING ON OR NEAR FLAP SYSTEM OR INJURIES TO PERSONNEL MAY RESULT.
(9)
Set landing flaps to UP position.
(10)
Set VOR/ILS switch on captain's instrument panel to NORMAL position.
(11)
Set MDA cursor on captain's LRRA indicator at lower mechanical stop.
(12)
Connect pressure source to pitot static systems that provides information to No. 1 air data computer (Ref 34-11-0).
NOTE: Observe procedures and limitations of air data system as defined in 34-12-0, Adjustment/Test.
(13)
Connect radio altimeter simulator to No. 1 radio altimeter receiver/transmitter.
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Nov 15/79 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-42-01 Page 501
C. System Self-Test
(1)
Press GROUND PROXIMITY INOP indicator. Check that indicator comes on when pressed.
(2)
Press and hold GROUND PROXIMITY SYS TEST switch on first officer's instrument panel for at least 5 seconds.
(3)
Check that PULL UP, BELOW G/S, INOP indicator lights come on and that loud aural warning consists of GLIDESLOPE and WHOOP-WHOOP-PULL-UP occur.
NOTE: The PULL-UP indicators come on flashing and the WHOOP-WHOOP-PULL-UP aural warning may repeat up to 7 times.
(4)
Release TEST switch, check that all GPWS indicators go off.
(5)
Open AIR DATA COMPTR - 1 circuit breaker. Check that INOP indicator comes on.
(6)
Press TEST switch for 5 seconds. Check that INOP and BELOW G/S indicators come on, and that on cycle of loud GLIDESLOPE aural warning occurs.
(7)
Release TEST switch and close circuit breaker. Check that indicator lights go off.
(8)
Open RADIO ALTM - 1 circuit breaker. Check that INOP indicator light comes on. Press TEST switch for 5 seconds. Check that INOP indicator light remains on.
(9)
Release TEST switch and close circuit breaker. Check that indicator light goes off.
D. System Test
(1)
Test Take Off Descent Warning
(a)
Using radio altimeter test set, simulate a radio altitude of 600 feet and press TEST switch for 5 seconds. Check that no warning occurs. Simulate a 400-foot radio altitude.
(b)
Pull landing gear override trigger and set landing gear lever to OFF position.
(c)
Using pitot static test set, set an altitude of 600 feet.
(d)
Simulate a barometric sink rate of 500 feet per minute. Check that PULL-UP indicators and aural warning consists of DON'T SINK come on between 4 to 9 seconds from start of sink rate simulation.
NOTE: Stop watch should be used to check the time requirement.
(e)
Increase radio altitude to 750 feet and barometric altitude to 10,000 ft. Check that GPWS warning goes off.
(2)
Test Excessive Sink Rate Warning
(a)
Simulate a 2000-foot radio altitude and a barometric altitude of 20,000 feet.
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