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(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
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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.
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(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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