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757 MAINTENANCE MANUAL
S 414-018
(6)
Close the cargo access panel.
S 024-052
(7)
Close forward and aft cargo doors (AMM 52-34-00/201).
S 864-019
(8)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11S35, FIRE DET CARGO CONT or CARGO SMOKE BLOWER CONT
(b)
11S36, FIRE DET FAN PWR or CAR SMK BLO
D. Do a Test of the Smoke Detector Blower Installation:
S 864-020
(1)
Supply electrical power (AMM 24-22-00/201).
S 754-021
(2)
Make sure these EICAS messages do not show on the bottom display. This shows that the smoke detector blower 1 (fwd) or 3 (aft) operates:
(a)
FWD DET FAN
(b)
AFT DET FAN
(c)
CARGO DET AIR
S 864-022
(3) Open these circuit breakers on the access panel to the forward cargo compartment, P70, which corresponds to the compartment (FWD or AFT) in which the blower was replaced.
(a)
70B10, SMOKE DET BLOWER 1 (FWD compartment)
(b)
70B12, SMOKE DET BLOWER 3 (AFT compartment)
S 754-025
(4) GUN 001-003 WITHOUT SL 26-9A; After 10 to 15 seconds, make sure the applicable EICAS message shows on the bottom display. This shows that the smoke detector blower 1 (fwd) or 3 (aft) does not operate:
NOTE: The EICAS maintenance message, CARGO DET AIR, may appear
____
momentarily.
(a)
FWD DET FAN
(b)
AFT DET FAN
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757 MAINTENANCE MANUAL
(c) Ten to 40 seconds after the circuit breaker is opened, make sure this EICAS message does not show on the bottom display. This shows that the smoke detector blower 2 (fwd) or 4 (aft) operates: 1) CARGO DET AIR
S 754-044
(5) GUN 004-999 AND AIRPLANES WITH SL 26-9A; After 10 to 15 seconds, make sure the applicable EICAS message shows on the bottom display. This shows that the smoke detector blower 1 (fwd) or 3 (aft) does not operate:
(a)
FWD DET FAN
(b)
AFT DET FAN
NOTE: The EICAS maintenance message, CARGO DET AIR, may appear
____
momentarily.
(c) Forty to 90 seconds after the circuit breaker is opened, make sure this EICAS message does not show on the bottom display. This shows that the smoke detector blower 2 (fwd) or 4 (aft) operates: 1) CARGO DET AIR
S 864-028
(6)
Close the circuit breaker on the P70 panel which was opened.
S 864-030
(7)
Open and then close these circuit breakers on the P11 panel to set the blower system for the smoke detectors:
(a) 11S35, FIRE DET CARGO CONT or CARGO SMOKE BLOWER CONT
S 754-031
(8) Make sure these EICAS messages do not show on the bottom display. This shows that smoke detector blower 2 (4) stops and blower 1 (3) operates:
(a)
FWD DET FAN
(b)
AFT DET FAN
(c)
CARGO DET AIR
E. Put the Airplane back to its Usual Condition.
S 864-029
(1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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757 MAINTENANCE MANUAL
SMOKE DETECTOR PLENUM PRESSURE SWITCH - REMOVAL/INSTALLATION
____________________________________________________________
1. General_______
A. The pressure switch, S10333, for the smoke detector in the forward cargo compartment is installed in the ceiling just aft of the No. 1 cargo door. Access the switch through the cargo ceiling panel. The pressure switch, S10332, for the smoke detector in the aft cargo compartment is installed in the sidewall just forward of the No. 2 cargo door. Get access to the switch through the sidewall panel.
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