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F. Restore Airplane to Normal
(1) Return all switches, flaps, and throttles to their normal positions.
(2) Remove electrical power if no longer required. 2A. Aural Warning Module BITE (69-78214-1 Series)
A. General
(1) The BITE is an operational check of the two channels in the aural warning module. Channel A and Channel B need to be tested separately. Failure of the BITE indicates failure of the module.
B. References
(1) 24-22-00/201, Manual Control
C. Access
(1) Location Zones
101/102 Flight Compartment
D. Procedure
(1)
Supply electrical power (AMM 24-22-00/201).
(2)
Make sure these circuit breakers are closed:
(a)
On the Load control center - right panel, P6:
1) LANDING GEAR - AIR/GND RELAY & LTS
2) ANTISKID FAIL WARN & PARK BK
3) AURAL WARN
4) MACH WARN SYS - 2
5) MASTER WARN & CONT
6) FIRE PROTECTION DETECTION - ENG NO. 1 7) FIRE PROTECTION DETECTION - ENG NO. 2
(b)
P18 Load Control Center - Left
1) MACH & WARN SYS
2) PASS & CREW CALL/LAV SMK DET
(3)
Do the channel A BITE test as follows:
(a)
Turn and hold the ROTATE TO TEST switch on top of the aural warning module to the A position. 1) Make sure you hear the intermittent horn.
(b)
Release the ROTATE TO TEST switch. 1) Make sure you hear the clacker for about 5 seconds.
(4)
Do the channel B BITE test as follows:
(a)
Turn and hold the ROTATE TO TEST switch on top of the aural warning module to the B position. 1) Make sure you hear the intermittent horn.
(b)
Release the ROTATE TO TEST switch. 1) Make sure you hear the clacker for about 5 seconds.
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E. Put the Airplane Back to Its Usual Condition
(1) Remove the electrical power if it is not necessary (AMM 24-22-00/201).
3. Cabin Altitude Warning Switch Test
A. General
(1)
The cabin altitude-warning switch controls the cabin altitude warning horn. The switch closes at cabin pressure equivalent to approximately 10,000 feet altitude.
(2)
The cabin altitude-warning switch is installed on the underside of the control cabin floor just forward of the center aisle control stand. Access to the switch is obtained by removing access door 1103 from just forward of the nose wheel well.
B. Equipment and Materials
(1) Pitot Static System Tester, No. 4 Union and O-ring
C. Prepare Cabin Altitude Warning Switch for Test
(1)
Remove forward access door 1103.
(2)
Provide electrical power.
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D. Test Cabin Altitude Warning Horn and Switch
(1)
Check that the following circuit breakers on panel P6 are closed:
(a)
AURAL WARN
(b)
LEVER LATCH AND PRESS WARNING
(2)
Connect pitot static system tester, No. 4 union and O-ring to vent port of cabin altitude warning switch.
(3)
Evacuate system and monitor tester altimeter.
(4)
Check that intermittent warning horn sounds at indicated altitude between 8750 and 11,250 feet.
(5)
Press ALTITUDE HORN CUTOUT switch and check that horn goes off.
(6)
Gradually lower indicated altitude to approximately 1700 feet below the horn actuating altitude noted in step (4).
(7)
Increase indicated altitude and check that horn again sounds between 8750 and 11,250 feet.
(8)
Reduce tester altitude to field level and disconnect pitot static system tester.
E. Restore Airplane to Normal Configuration
(1)
Install forward access panel.
(2)
Remove electrical power if no longer required.
4. Landing Gear Warning System Test
A. General
(1) The landing gear warning system should be tested after maintenance has been performed on a component to ensure that the system is functioning properly. The test consists of two separate parts. Prepare to test steps must be completed prior to performing any tests.
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