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COMPUTER P/N 65-52819 ú CONFIG 1 ú 01 Page 103 ú Mar 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
STALL WARNING SYSTEM - TROUBLE SHOOTING
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1. General_______
A. This trouble shooting procedure uses the BITE feature of the stall management computer (SMC) to isolate faults in the stall warning system and the autoslat system. All interface with the BITE is through the maintenance control panel on the front of each SMC.
B. A confidence test of the stall warning system can be performed from the flight deck. Pushing the STALL WARNING TEST NO. 1 or NO. 2 switch on the P5-18 panel will activate the corresponding control column shaker. If the shaker does not activate, there is a fault in the stall warning system. The SMC BITE will assist in isolating the fault.
C. The SMC will allow entry into BITE only when one or more of these conditions exist:
(1)
Engines off. For SMC 1: Engine 1 N1 < 15%, Engine 2 N2 < 50% For SMC 2: Engine 2 N1 < 15%, Engine 1 N2 < 50%
(2)
Airspeed < 60 knots AND flaps fully retracted.
2. BITE Control and Display________________________
A. The maintenance control panel on the front of the SMC has two 8-character displays and 6 buttons for fault isolation and for checks during ground maintenance.
(1)
The ON/OFF button activates and deactivates the BITE feature. All buttons on the SMC are normally inactive until the ON/OFF button is pushed to activate BITE.
(2)
The MENU button displays the current menu at any point in BITE. Pushing the MENU button interrupts any active test mode and returns to the most recently selected option of the current higher level menu.
(3)
The up arrow and down arrow buttons are used to sequence through the items under each menu.
(a)
If the up button is pushed when a list item or a menu option is shown, the previous item/option will be displayed.
NOTE:____ A list item does not have a question mark (?) at the end. A menu option has a question mark at the end.
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COMPUTER P/N 65-52822 ú CONFIG 2 ú 01 Page 101 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(b)
If the up button is held down, approximately 4 items/options per second will be shown in sequence until the button is released or until the first item/option is shown; at this time the display will show BEGIN OF LIST.
(c)
If the down button is pushed when an item/option is shown, the next item/option will be shown. If the down button is held down, approximately 4 items/options per second will be shown in sequence until the button is released or until the last item is displayed; at this time the display will show END OF LIST.
(4)
The YES button is pushed to answer a menu option.
(5)
The NO button is pushed to answer a menu option. If the NO button is held down, options will be shown in sequence at approximately 4 options per second until the button is released or until the last item is displayed; at this time the display will show END OF LIST.
(6)
If the YES or NO button is pushed when it is not appropriate (such as when stepping through a list), the display will show BUTTON INACTIVE.
B.
To enter BITE, push the ON/OFF button. A BITE entry test will automatically be performed by the SMC.
(1)
If the entry test fails, the display will show TEST FAIL momentarily, followed by nn FAULTS, where nn is the number of faults detected during the entry test. Then the display will show the first fault. Other faults (if they exist) will be shown as the down button is pushed repeatedly.
(2)
If the entry test passes, the display will show SYS OK. Push the menu button to access the options on the main menu. These are the main menu options:
(a)
PRESENT FAULTS?
1) PRESENT FAULTS provides the continuously updated (real time) status of interface signals.
(b)
SELF TEST?
1) The SELF TEST option runs a test of the SMC LRU itself. During the test, the display shows TEST IN PROGRESS, followed by either SMC LRU OK or SMC LRU FAIL. For a failed test, after SMC LRU FAIL shows momentarily, nn FAULTS shows, then DISP FAULTS? shows. If you answer yes to DISP FAULTS?, the display shows a list of faults internal to the SMC.
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