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A
757
MAINTENANCE MANUAL
SEE A
APU
FIREWALL
SEE B
A
APU Fire Extinguisher Bottle/Discharge Cartridge Installation
Figure 501 (Sheet 1)
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A
757 MAINTENANCE MANUAL
PRESSURE SWITCH HEX KEY FOR
APU Fire Extinguisher Bottle/Discharge Cartridge Installation
Figure 501 (Sheet 2)
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D02983
A
757 MAINTENANCE MANUAL
D. Test Fire Extinguisher Bottle Pressure Switch
S 015-157
WARNING: STAY OFF THE SERVICE ACCESS DOOR, 311AL, AND THE ACCESS DOOR
_______ FOR THE CONTROLS BAY, 313AL. YOUR WEIGHT CAN CAUSE THE SPRING-LOADED LATCHES TO RELEASE. IF YOU FALL THROUGH THE DOOR, INJURY CAN OCCUR.
(1) Open the controls bay access door, 313AL (AMM 06-42-00).
S 865-177
CAUTION:_______DO NOT TURN THE HEX KEY MORE THAN 1/4 OF A TURN. IF YOU TURN THE HEX KEY MORE THAN 1/4 OF A TURN, DAMAGE TO THE SWITCH MAY OCCUR.
(2)
GUN 051; At the APU fire extinguisher bottle, turn and hold the ground test hex key 1/4 turn counterclockwise.
S 865-178
(3)
GUN 001-050, 052-999; At the APU fire extinguisher bottle, push and hold the ground test pushbutton.
S 725-010
(4)
Make sure the yellow APU BTL DISCH light on the P8 panel comes on.
S 735-018
(5)
Make sure the EICAS message, APU BTL, shows on the top display.
S 865-179
(6)
GUN 051;
Release the ground test hex key.
S 865-180
(7)
GUN 001-050, 051-999;
Release the ground test pushbutton.
(8)
Make sure the APU BTL DISCH light on the P8 panel goes off.
S 735-024
(9)
Make sure the EICAS message, APU BTL, does not show on the top display.
S 745-021
E. Put the Airplane Back to its Usual Condition
S 865-158
(1) Remove the electrical power if it is not necessary (AMM 24-22-00).
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757 MAINTENANCE MANUAL
S 415-160
(2) Close the access door, 313AL (AMM 06-42-00).
TASK 26-22-00-715-140
3. Operational Test - APU Squib Test Circuit_________________________________________
A. References
(1) AMM 24-22-00/201, Electrical Power - Control
B. Access
(1) Location Zones
211 Flight Compartment (Left)
212 Flight Compartment (Right)
C. Prepare for Test
S 865-161
(1) Supply electrical power (AMM 24-22-00).
D. APU Squib Test Circuit Test
S 865-190
(1) Make sure that the following circuit breaker on the Pilot's Right Sidewall Panel (P61) is closed:
(a) 6H1, BTL 1 ENG L FIRE EXTINGUISHING
S 715-028
(2)
At the Squib Test control panel, P61, push and hold the TEST switch.
S 745-172
(3)
Make sure the green APU squib test light on the Squib Test control panel comes on.
S 865-031
(4)
Release the TEST switch.
S 745-033
(5)
Make sure the APU squib test light goes off.
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