26-16-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 024-051
(6)
Close main cargo door (AMM 52-34-00/201).
S 864-013
(7)
Remove 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 Pressure Switch Installation:
S 864-014
(1)
Supply electrical power (AMM 24-22-00/201).
S 754-015
(2)
Make sure the SMOKE DET BLOWER 1 (FWD) or SMOKE DET BLOWER 3 (AFT) which is applicable to where the switch was installed does operate.
S 864-016
(3)
Open these circuit breaker on the access panel to the forward cargo compartment (P70) which is applicable to the cargo compartment (FWD or AFT) where the switch was replaced:
(a)
70B10, SMOKE DET BLOWER 1 (FWD compartment)
(b)
70B12, SMOKE DET BLOWER 3 (AFT compartment)
S 754-024
(4) GUN 001-003 WITHOUT SL 26-9A; After 10 to 40 seconds, make sure these EICAS messages do not show on the top display. This will make sure SMOKE DET BLOWER 2 (FWD) or SMOKE DET BLOWER 4 (AFT) operates.
(a)
FWD DET FAN
(b)
AFT DET FAN
(c)
CARGO DET AIR
S 754-033
(5)
GUN 004-999 AND AIRPLANES WITH SL 26-9A; After 60 to 90 seconds, make sure these EICAS messages do not show on the top display. This will make sure SMOKE DET BLOWER 2 (FWD) or SMOKE DET BLOWER 4 (AFT) operates:
(a)
FWD DET FAN
(b)
AFT DET FAN
(c)
CARGO DET AIR
(6)
Close circuit breakers (P70) which were opened.
S 864-036
(7)
Open and then close these circuit breakers to set the system:
S 864-035
(a) 11S35, FIRE DET CARGO CONT or CARGO SMOKE BLOWER CONT
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
S 754-037
(8) Make sure SMOKE DET BLOWER 2 (4) stops and SMOKE DET BLOWER 1 (3) operates.
E. Put the Airplane back to its Usual Condition.
S 864-038
(1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
26-16-03
ALL ú ú 02 Page 405 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
SMOKE DETECTOR FAN ISOLATION FLAPPER VALVE - MAINTENANCE PRACTICES
__________________________________________________________________
1. General_______
A. This procedure is used for these maintenance practices:
(1)
Flapper Valve Integrity Check using a vacuum gage.
(2)
Comprehensive Flapper Valve Inspection/Check
(3)
Flapper Valve Replacement
B. This procedure is an operational check. It includes operation serviceable instructions for the cargo smoke detector fan isolation flapper valve.
TASK 26-16-05-702-001
2. Flapper Valve Integrity Check_____________________________
A. Equipment
(1) Vacuum Gauge - Hand-held, 0-10 inches of water - Model 104-10, DWYER INSTRUMENTS INC., MICHIGAN CITY, INDIANA, or equivalent.
B. References
(1)
AMM 24-22-00/201, Electrical Power - Control
(2)
AMM 26-16-02/401, Smoke Detector Blowers
(3)
AMM 52-34-00/201, No. 1 and No. 2 Cargo Doors
C. Access
(1)
Location Zones
121/122 Forward Cargo Compartment
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