(g)
Put air/ground relay system back to ground mode.
(h)
Install a jumper between pins 2 and 3 of electrical connector DM7933.
(i)
Check that the ground crew call horn is activated and the
following messages are displayed (allow 60 seconds): ~.................................................. | EICAS caution | EQUIP COOLING | .................................................... | EICAS status | FLT DK LOW FLOW | 2.........................…........................1
(j)
Remove electrical connector DM7934 from forward rack low flow detector.
(k)
Install a jumper between pins 2 and 3 of electrical connector DM7934.
(l)
Check that status message EQUIP LOW FLOW is displayed on EICAS (allow 60 seconds).
(m)
Check that EICAS status message FLT DK LOW FLOW is not displayed.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(n)
Check that EICAS caution message EQUIP COOLING remains displayed.
(o)
Check that ground crew call horn remains activated.
(p)
Remove jumper from flight deck low flow detector electrical connector DM7933.
(q)
Install electrical connector DM7933 on flight deck low flow detector.
(r)
Check that the following mesages remain displayed:
~..................................................
| EICAS Caution | EQUIP COOLING |
....................................................
| EICAS Status | EQUIP LOW FLOW |
2.........................…........................1
(s)
Check that ground crew call horn remains activated.
(t)
Remove jumper from forward rack low flow detector electrical connector DM7934.
(u)
Open then close this circuit breaker on DC power distribution panel P180, to silence the ground crew call horn. 1) 180B04, IRS ON BAT
(v)
Put air/ground relay system in air mode.
(w)
Check that the following messages are not displayed:
~..................................................
| EICAS caution | EQUIP COOLING |
....................................................
| EICAS status | EQUIP LOW FLOW |
2.........................…........................1
(x)
Install jumper between pins 2 and 3 of electrical connector DM7934.
(y)
Check that the following messages are displayed (allow 30
seconds): ~.................................................. | EICAS caution | EQUIP COOLING | .................................................... | EICAS status | EQUIP LOW FLOW | 2.........................…........................1
(z)
Check that ground crew call horn is not activated. (aa) Remove jumper from electrical connector DM7934. (ab) Install electrical connector DM7934 on forward rack low flow
detector.
(ac) Check that the following messages are not displayed:
~..................................................
| EICAS Caution | EQUIP COOLING |
....................................................
| EICAS Status | EQUIP LOW FLOW |
2.........................…........................1
(ad) Put air/ground relay system back to ground mode.
S 735-019
(36) Do a test of the equipment cooling system in each mode of operation.
(a) Remove the electrical connector DS1888 from the skin
temperature switch.
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