NOTE: GLIDE SLOPE voice warning is referred to as G/S
____
warning from here on.
(i)
Set barometric sink rate to 3500 feet per minute. Check that GLIDE SLOPE aural warning ceases, the GPWS indicator illuminates, and WHOOP WHOOP PULL UP aural warning is actuated.
(j)
Set barometric sink rate to 0 feet per minute. Check that GPWS visual and aural warnings cease and GLIDE SLOPE aural warning is reactivated.
(k)
Reduce GS deviation to 0 dot (center). Check that G/S warning goes off.
EFFECTIVITY
AIRPLANES WITH SUNDSTRAND CONFIG 2 MARK II COMPUTERS 08 Page 504 Apr 25/85
34-46-00
(l)
Reduce radio altitude to 250 feet and slowly increase GS deviation signal. Check that G/S warning comes on between 1 and 1-1/2-dot fly up deviation.
(m)
Further increase GS deviation signal. Check that G/S warning comes on between 1-3/4 and 2-1/4-dot fly up deviation with a hard (high level) voice at a repetition rate approximately once every 1-1/2 seconds.
(n)
Slowly reduce G/S deviation signal. Check that G/S warning reduces in volume at 1/4 to 1/2 dots less than in step (m).
(o)
Slowly reduce G/S deviation signal. Check that G/S warning goes off at 1/4 to 1/2 dots less than in step (l).
(p)
Reduce radio altitude to 120 feet. Increase GS deviation signal to 2-dot fly up.
(q)
Check that G/S warning comes on with a hard voice between 1-1/2 to 2-dot fly up at a repetition rate of approximately once every 1-1/2 seconds.
(r)
Momentarily press PUSH TO INHIBIT switch located on pilot's lightshield. Check that G/S warning goes off.
(8) Restore airplane to normal.
(a)
Slowly relieve pitot static system and remove test adapters. Refer to 34-11-00 and 34-12-00.
(b)
Reset radio altitude to normal and disconnect test simulator. Refer to 34-33-00.
(c)
If no longer required, remove electrical power. Refer to 24-22-00.
(d)
Reset VOR/ILS system to normal. Refer to 34-31-00.
EFFECTIVITY
AIRPLANES WITH SUNDSTRAND CONFIG 2 MARK II COMPUTERS 13 Page 505 Apr 25/85
34-46-00
GROUND PROXIMITY WARNING COMPUTER - REMOVAL/INSTALLATION
________________________________________________________
1. Referenced Procedures
_____________________
A. 23-51-00, Adjustment/Test
B. 24-22-00 Maintenance Practices (Apply Power)
2. Remove Ground Proximity Warning Computer
________________________________________
A. Open GROUND PROX WARN CMPTR circuit breaker on panel P7.
B. Gain access to main equipment center.
C. Remove computer from shelf.
3. Install Ground Proximity Warning Computer
_________________________________________
A. Install computer on shelf.
B. Close circuit breaker opened in step 2A.
C. Test computer.
(1)
Provide electrical power (Ref 24-22-00).
(2)
Verify that CADC 1 PWR and SYNC EXCIT; ALTIM LOW 1 circuit breakers on panel P7, and pilots' IND LTS circuit breakers on panel P12 are closed.
(3)
Verify that cockpit interphone system is operating (Ref 23-51-00).
(4)
Computer Test (AZ ALL)
(a)
Press and hold GROUND PROXIMITY TEST switch on center instrument panel.
(b)
Check that GPWS, BELOW G/S, and GPWS INOP (flight engineer's instrument panel) indicator light come on and that loud aural warning consists of GLIDE SLOPE and WHOOP-WHOOP PULL UP occur.
NOTE: The WHOOP-WHOOP PULL UP aural warning may repeat up to
____ seven times.
(c) Release GROUND PROXIMITY TEST switch, check that all GPWS indicators go off.
(5) Computer Test (XA ALL EXCEPT AZ)
(a) Press and hold TEST switch on computer.
XA (b) On LH ALL; AT ALL, check that the fault indicator lamps on the computer come on flashing momentarily indicating signals are valid and the GPWC OK light comes on momentarily when all modes are valid.
(c) On AF ALL; GN ALL; MD ALL; VM ALL, check that validity indicators and test lamp on the computer illuminate.
XA (d) On AT ALL WITH SUNDSTRAND 965-0376-070 COMPUTERS, check that the fault indicator lamps on the computer come on flashing momentarily indicating signals are valid, and the mode annunciators on the computer will display white as each mode is exercised and checked. The GPWC OK light comes on momentarily when all modes are valid. The annunciator may be reset manually by means of the RESET switch on the computer.
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