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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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MAINTENANCE MANUAL
S 445-226
(3)
Do the activation procedure for the spoilers (AMM 27-61-00/201) if you did the deactivation procedure.
S 865-425
(4)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 21-51-00-705-264
7. Heat Exchanger Test (Fig. 504)
___________________
A. General
(1)
This procedure has the steps to do a health check for the primary and secondary heat exchangers.
(2)
A health check gives a quick indication that the system operates correctly.
B.
Special Tools and Equipment
(1)
Thermocouple Probe - P/N 98220K, Omega Technologies, Stamford, CT 06907
C.
References
(1)
AMM 20-41-01/201, Electrostatic Discharge Sensitive Devices
(2)
AMM 21-51-00/501, Operational Test - Cooling Pack System
(3)
AMM 21-61-00/501, Operational Test - Primary (Zone) Temperature Control System
(4)
AMM 24-22-00/201, Electrical Power - General
(5)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
(6)
AMM 32-09-02/201, Air/Ground Relays
(7)
AMM 49-11-00/201, Auxiliary Power Unit
(8)
AMM 49-61-05/201, APU Control Unit (ECU)
(9)
AMM 77-12-03/401, Engine Speed Card
D.
Access
(1)
Location Zones
135/136 Environmental control system (ECS) bay
211/212 Control cabin
(2)
Access Doors
193HL Environmental control system bay (left)
194ER Environmental control system bay (right)
E.
Prepare for the Test
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-429
(2)
Make sure all circuit breakers for the air conditioning system are closed.
S 865-431
(3)
Make sure the BLEED AIR L ENG and BLEED AIR R ENG switches on the P5 panel are OFF.
S 865-427
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ú ú ú 12.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 532Sep 28/02
A
757
MAINTENANCE MANUAL
(4) S 745-231Do the BITE tests for these components: (a) Pack temperature controller (AMM 21-51-00/501) (b) Standby temperature controller (AMM 21-51-00/501). (c) Zone temperature controller (AMM 21-61-00/501). (d) APU ECU (AMM 49-11-00/501).
(5) S 015-232Open the left (right) air conditioning bay doors.
(6) S 865-433Push the AUTO switch on the display select panel, P7.
(7) S 865-435Push the ECS/MSG switch on the EICAS maintenance panel, P61.
(8) S 865-437Set the L (R) RECIRC FAN switches to ON.
(9) S 865-439Set the temperature selectors (FLT DK, FWD CAB, and AFT CAB) on the P5 panel to AUTO (8:00 o'clock position).
S 865-441
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