(b)
The EICAS message TEST PASSED shows when the test is completed.
NOTE: The EICAS message, FIRE TEST FAIL, will show if the
____ circuit breakers are open or there is a problem on a related fire detection system.
(c)
FIRE WHEEL WELL does not show on the EICAS display.
(d)
The fire bell in the flight compartment operates.
(e)
The two master warning lights on the main instrument light shield, P72, come on.
S 715-006
(3)
Release the switch and make sure the warnings go off.
S 865-022
(4)
After approximately twenty seconds, make sure the EICAS display indications for the wheel well heat do not show.
E.
Do the Operational Test That Uses the CMC
(1)
Set one of these switches to the ENABLE position:
S 865-030
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A
747-400 MAINTENANCE MANUAL
(a)
S2089, Ground Test Enable Switch (P461)
(b)
S2090, Remote Test Enable Switch (RCDU).
S 845-007
(2)
Set the CMC to the CMC main menu.
S 865-008
(3)
Push the line-select key (refered to as LSK) adjacent to the <GROUND TEST position on the screen.
S 865-009
(4)
Push the LSK adjacent to the <26 FIRE PROTECTION position on the menu.
S 865-011
(5)
Push the LSK adjacent to the <FIRE SYSTEM TEST position on the GROUND TESTS menu.
S 745-012
(6)
The IN PROGRESS indication will show until the end of the test.
S 745-013
(7)
The CDU screen shows PASS or FAIL> when the test is completed.
S 745-014
(8)
If PASS shows, the test is completed.
S 745-015
(9)
If FAIL> shows, push the LSK adjacent to the FAIL> position.
S 745-032
(10)
Do the necessary step(s) to correct the CMC message(s) given. (Use the NEXT PAGE or PREV PAGE button to look through the messages.)
NOTE: FAIL> will show if the circuit breakers are open or there is
____ a problem on a related fire protection system.
F. Put the Airplane Back to Its Usual Condition
S 865-031
(1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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MAINTENANCE MANUAL
TASK 26-17-00-765-041
3. System Test - Wheel Well Detector Loop Continuity and Element Resistance Test_____________________________________________________________________________
A. Standard Tools and Equipment
(1)
Meter - Tegam Inc, Models 252, 253 or SP2596, SP2598 (battery operated models) (Formerly ESI meters)
(2)
Multimeter - Wavetek Corporation Digital Model 850
(3)
Test Pin - Fenwal Safety System P/N 06-134724-000
B.
References
(1)
AMM 32-00-00/201, Landing Gear
(2)
AMM 32-00-30/201, Landing Gear Door Locks
(3)
Fenwal Erospace CMM 26-14-12
(4)
IPC 26-17-02, Figure 02
(5)
WDM 26-17-11, Wheel Well Fire Detection
(6)
SSM 26-17-01
C.
Access
(1)
Location Zone
135/136 Wing Landing Wheel Well
137/138 Body Landing Wheel Well
(2)
Access Panel 731/732 Wing Landing Gear - Center Section Inboard/Outboard, LH 741/742 Wing Landing Gear - Center Section Inboard/Outboard, RH
751/752 Landing Gear - Aft Inboard/Outboard Left 753/754 Landing Gear - Forward Inboard/Outboard Left 761/762 Landing Gear - Aft Inboard/Outboard Right 763/764 Landing Gear - Forward Inboard/Outboard Right
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