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757 MAINTENANCE MANUAL
 S 866-313
 (9)  Erase the ECS/MSG EICAS messages that are kept in non-volatile memory (NVM).
 (a)  
Press the ECS/MSG switch on the P61 panel.

 (b)  
Press the AUTO-EVENT READ switch on the P61 panel.

 (c)  
Press and hold the ERASE switch for 3 seconds.

 NOTE: If PAGE indication show more pages of messages, press
____ and hold the ERASE switch for 3 seconds. The next page of messages will then show. Continue until no PAGE indication shows.
 (d)  
Press the ECS/MSG switch to view all maintenance messages.

 (e)  
Make sure the EICAS message, FWD CARGO FAN, does not show on the lower display.

 S 866-222
 (10) Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P6 panel:
 (a)  
6H5, FIRE EXTINGUISHING CARGO BTL 1

 (b)  
6H6, FIRE EXTINGUISHING CARGO BTL 2

 TASK 26-23-01-716-179
 4.  Aft Cargo Heat Stops After the AFT ARMED Switch Activation Check________________________________________________________________
 A.  Access
 (1)  
Location Zones
 153 Aft Cargo Compartment (Left)
 154 Aft Cargo Compartment (Right)
 211/212 Flight Compartment

 (2)  
Access Panels
 822 Aft Cargo Compartment Door

 B.  Do a check of the Aft Cargo Heat Stops After the AFT ARMED Switch Activation
 S 866-223
 (1) Make sure these circuit breakers on the P11 panel are closed:
 (a)  
11N1, INSTRUMENT AND PANEL AISLE STAND

 (b)  
11N18, CARGO HEAT AFT or AFT CARGO HEAT

 (c)  
11N21, CARGO HEAT FAN AFT or FAN CONT AFT CARGO

 (d)  
11S15, AIR/GND SYS 1

 (e)  
11S19, AIR/GND SYS 2

 S 866-224
 (2) Make sure this circuit breaker on the P37 panel is closed:
 (a)  37C2, AFT CARGO FAN
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757 MAINTENANCE MANUAL
 (3)  S 866-225Make sure this circuit breaker on the P70 panel is closed: (a) 70C8, AFT CARGO HTR
 (4)  S 866-226Open these circuit breakers on the P6 panel and attach DO-NOT-CLOSE tags: (a) 6H5, FIRE EXTINGUISHING CARGO BTL 1 (b) 6H6, FIRE EXTINGUISHING CARGO BTL 2
 (5)  S 746-227Make sure the AFT Cargo Fire ARMED switchlight is OFF on the aft pilot's control stand, P8.
 (6)  S 886-228If the temperature in the Aft Cargo Compartment is above 50°F, do one of the steps that follow to decrease the temperature control switch to 50°F maximum:
 NOTE:____ The Temperature Control Switch can be found below the Aft Cargo Heating Intake Duct.
 (a) (b)  Use an ice pack to cool the Temperature Control Switch.Insert a jumper betrween pins 1 and 2 of the electrical connector D1638 on the Temperature control Switch.
 (7)  S 716-229Take your hand and feel for the airflow at the nozzle (STA 1210, LBL 50, WL 170) to make sure that the Aft Cargo Compartment heating fan starts.
 (8)  S 866-230Push the AFT Cargo Fire switch. (a) Make sure these conditions occur: 1) AFT ARMED switchlight is ON. 2) The EICAS message, AFT CARGO FAN, is shown on the lower display. 3) The AFT Cargo compartment heating fan stops.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757
MAINTENANCE MANUAL

 S 866-232
 (9)  Push the AFT Cargo Fire switch and release.
 (a)  Make sure these conditions occur:
 1) AFT ARMED switchlight is OFF.

 2) The AFT Cargo Compartment heating fan starts.
 S 866-314
 (10) Erase the ECS/MSG EICAS messages that are kept in non-volatile memory (NVM).
　
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