21-45-00
ALL ú ú 01 Page 503 ú Jun 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
CAUTION: REFER TO 32-09-02 FOR THE FLIGHT MODE SIMULATION.
_______ EQUIPMENT DAMAGE CAN OCCUR IF YOU DO NOT OBEY THE INSTRUCTIONS.
(h) Simulate the system No. 1 and 2 air/ground relays in the flight mode (Ref 32-09-02).
CAUTION: DO THE SHOULDER HEATER TEST IN THE SUBSEQUENT TEN MINUTES
_______ TO MAKE SURE THAT THE SYSTEM DOES NOT BECOME TOO HOT.
(i) Do these steps in the subsequent 10 minutes:
1) Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P37 and P70 panels: a) 37F4, HEATERS F/O AUX b) 70A6, CAPT AUX HTR HI
2) Put the flight officer's shoulder heater switch on the P14 panel to HIGH. a) Make sure the temperature increases during the
subsequent two minutes. 3) Put the flight officer's shoulder heater switch to OFF. 4) Do the last three steps for the captain's shoulder heater
with the switch on the P13 panel.
(j)
Put the airplane back to the ground mode (Ref 32-09-02).
(k)
Put the L and R RECIRC FAN switch-lights on the P5 panel to the off position.
S 735-010
(6)
Do a test of the foot heater:
(a)
Put an ice pack on the aft part of the flight officer's foot heater. 1) Make sure the temperature of foot heater is less than 45°F
(7.2°C).
2) Remove the ice pack.
(b)
Put the flight officer's foot heater switch on the P14 panel to LOW. 1) Make sure the two flight officer's foot heaters become
warm.
(c)
Put the flight officer's foot heater switch to HIGH.
1) Make sure the two flight officer's foot heaters continue to supply heat and increase in temperature.
(d)
Put the flight officer's foot heater switch to OFF.
(e)
Do the foot heater test for the captain's foot heater with the switch on the P13 panel.
(7)
Remove electrical power, if it is not necessary (Ref 24-22-00).
S 865-012
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21-45-00
ALL ú ú 01 Page 504 ú Jun 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
FOOT ELECTRIC SURFACE HEATERS - REMOVAL/INSTALLATION
____________________________________________________
1. General_______
A. This procedure contains two tasks. The first task is the removal of the foot electric heaters. The second task is the installation of the foot electric surface heaters.
B. Four foot heaters are in the forward part of the flight deck floor. A left and right foot heater for the captain are on the left side of the airplane. A left and right foot heater for the first officer are on the right side of the airplane.
TASK 21-45-01-004-001
2. Remove the Foot Electric Surface Heaters (Fig. 401)________________________________________
A. References
(1)
AMM 24-22-00/201, Electrical Power Control
B.
Access
(1)
Location Zones
211/212 Control Cabin - Section 41
C.
Procedure
S 864-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-004
(2)
Put the applicable first officer's or captain's foot heater selector to OFF.
NOTE: The first officer's foot heater selector is on the F/O
____ auxiliary instrument forward panel, P14. The captain's foot heater selector is on the captain's auxiliary instrument forward panel, P13.
S 864-005
(3)
For removal of the first officer's foot heaters, open these circuit breakers on the right miscellaneous relay panel, P37, and attach DO-NOT-CLOSE tags:
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