(2)
The cabin altitude warning switch is on the floor, near the center aisle control stand. Access to the switch is through the access door, forward of the nose wheel well on the bottom of the airplane.
B. Equipment
(1) Pitot Static System Tester - Castleberry AT700-2 or equivalent, No. 4 Union and O-ring.
C. References
(1)
AMM 24-22-00/201, Manual Control
(2)
34-11-00/501, Pitot Static System
(3)
AMM 34-11-01/501, Pitot Static System
D. Access
(1) Location Zone
101/102 Control Cabin
E. Procedure
S 015-027
(1)
Open the forward access door.
S 865-028
(2)
Supply electrical power (AMM 24-22-00/201).
S 865-029
(3)
Make sure these circuit breakers are closed:
(a) On the load control center - right panel, P6: 1) AURAL WARN 2) LND GR LATCH & PRESS WARN
S 715-154
(4) Do a test of the altitude warning horn.
(a) Connect the pitot static system tester (No. 4 Union and O-ring) to the vent port of the warning switch for the cabin altitude (AMM 34-11-00/501 or 34-11-01/501).
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737-300/400/500MAINTENANCE MANUAL
(b)
Operate the system and monitor the altimeter.
(c)
Make a record of the altitude at which you hear the warning horn. 1) Make sure you hear the intermittent warning horn at an
altitude between 8750 and 11,250.
(d)
Push the switch for the ALTITUDE HORN CUTOUT. 1) Make sure the warning horn stops.
(e)
Slowly lower the altitude shown to approximately 1700 feet below the altitude at which you hear the horn.
(f)
Increase the altitude.
1) Make sure the horn is again heard between 8750 and 11,250 feet.
(g)
Decrease the altitude to the ground level.
S 085-037
(5)
Disconnect the pitot static system equipment.
S 415-038
(6)
Close the forward access panel.
S 865-039
(7)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 31-26-00-725-040
6. Landing Warning System Test___________________________
A. General
(1)
Always test the landing warning system if maintenance is done on a component. The test is divided into two parts. Prepare to test steps must be completed before you do the tests.
(2)
In tests of the landing aural warn functions it is necessary to extend and retract the nose, right main, and left main landing gear. If airplane jacks are not available, it will be necessary to put the landing gear into a simulated position.
(3)
The first test uses airplane jacks. The second test uses simulated landing gear positions.
(4)
The warning horn that you hear in the tests that follow will be continuous.
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737-300/400/500MAINTENANCE MANUAL
(5) Do the first test, Airplane On Jacks, when a check of the position sensor switches on the landing gear is necessary. Do the second test, Simulated Landing Gear Position, when airplane jacks are not available. Also When it is not possible to put the airplane on jacks.
NOTE: When you lift the airplane until all wheels are off the
____ ground, the airplane is the AIR mode. This stops the operation of the logic inputs to the takeoff warning (intermittant horn) circuits. The AIR mode is necessary for tests of the landing warning system.
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