(d)
Repeat steps (a) thru (c) for fly-down signal.
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E. Restore Airplane to Normal Configuration
(1)
Remove test equipment.
(2)
Open vertical gyro circuit breakers and wait approximately 15 minutes for vertical gyros to coast down.
(3)
Install vertical gyros in airplane and close vertical gyro circuit breakers. Verify that this system indicates attitude of airplane.
(4)
If no longer required, remove electrical power from airplane.
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NAVIGATION WARNING SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
WA LL EXCEPT N4569N and N4571M and N4502W thru N4530W GJ -2509 and B-2510
1. Navigation Warning System Test
A. General
(1) Prior to performing test procedures for the navigation warning system, determine that the autopilot, radio altimeter, VHF navigation, compass, and attitude reference (vertical gyro) systems are operational.
B. Equipment and Materials
(1)
Ramp and Bench Test Set - Collins Type 972Q-4 or Instrument Flight Research Type NAV 401L (two required)
(2)
Calibrated Tilt Table (two required)
(3)
Radio altimeter test set (simulator)
C. Prepare to Test Navigation Warning System
(1)
Connect external electrical power and energize P6 circuit breaker panel.
(2)
Check that following circuit breakers are closed: captain's and first officer's instruments, compasses 1 and 2, VOR-1, VOR-2, GS-1, GS-2, instrument transfer, autopilot, radio altimeter, and comparator systems.
(3)
Turn on signal generators, allow to warm up and calibrate as indicated in signal generator instruction manual.
D. Test Navigation Warning System
(1) Test Power, Dim and Test
(a)
Place vertical gyro, compass, and VHF NAV transfer switches in NORMAL position.
(b)
Synchronize both compass systems and level vertical gyros using calibrated tilt table.
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(c)
Check that captain's and first officer's instrument warning panel lights are out.
(d)
Open comparator power circuit breaker. Check that MON PWR light on captain's and first officer's instrument warning panels come on.
(e)
Push either captain's or first officer's instrument warning panel face. Check that instrument warning panel lights dim.
(f)
Close comparator power circuit breaker. Check that MON PWR lights go out.
(g)
Press comparator test button on captain's instrument panel. Check that all lights except MON PWR lights on captain's and first officer's instrument warning panels come on.
(2)
Test Compass Warning
(a)
Select heading mode on autopilot (HDG SEL switch on P7 panel). Slew captain's HSI compass card in an increasing direction to a heading of 6 士 2 degrees higher than first officer's HSI heading card. Check that HDG lights come on in less than 10 seconds.
(b)
Repeat step (a) slewing first officer's HSI heading card.
(c)
Resynchronize both compass systems.
(d)
Tilt vertical gyros 20 degrees in right roll. Repeat steps (a) through (c) using 10 士 2.5 degrees offsets in captain's and first officer's HSI headings.
(e)
Repeat step (d) for 20 degrees left roll.
(f)
Level vertical gyros. Engage autopilots and select APP mode. Tune both VHF NAV receivers to 108.10 MHz. Provide zero deviation glide slope and localizer signals to both VHF NAV receivers. Repeat tests (a) and (b) with heading differences of 4.5 士 1 degrees.
(g)
Return autopilot to HDG SEL mode.
(3)
Test Pitch Warning
(a)
Tilt No. 1 vertical gyro two degrees nose up and No. 2 vertical gyro 2.0 士 1.6 degrees nose down. Check that PITCH light on captain's and first officer's instrument warning panels come on.
(b)
Tilt No. 1 vertical gyro 10 degrees nose up. Tilt No. 2 vertical gyro 6.0 士 1.6 degrees nose up. Check that PITCH light comes on.
(c)
Tilt No. 2 vertical gyro 14 士 1.6 degrees nose up. Check that PITCH lights come on.
(d)
Repeat steps (b) and (c) for nose down.
(e)
Select APP mode; PITCH light on captain's and first officer's warning panel should come on when No. 1 vertical gyro is tilted 3 士 1 degrees nose up, while No. 2 vertical gyro is kept level.
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