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777 fuel press on off "press" means off in PPF

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777 fuel press on off "press" means off in PPF

Old 24th Oct 2020, 16:39
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777 fuel press on off "press" means off in PPF

In Prelimanary preflight inspection .All the overhead lights button display off and on or blank meaning off expect for the fuel panel,if you check for on it says that check pressure light illuminated on all light except for centre pumps which has pressure lights extinguished,So for fuel panel is the off meaning of primary fuel pumps,like eng and centre main tanks PRESSURE acutally meaning thats its OFF actually.Since ive previously flown airbus im a bit unsure.thanks as it has dark cockpit philosophy,also
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Old 25th Oct 2020, 06:10
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It's been 20 years since I was in the cockpit of a 777 (as an engineer in flight testing - not a pilot) but here is what I recall. Hopefully someone else can confirm or correct this.

The PRESS light on the fuel pump switches means low pressure. However, unlike the main tank boost pumps, the center tank pump low pressure lights are inhibited if the pump switches are off because normal operation of the airplane includes operation with those switches off (after the center tank is depleted of if there is no mission fuel in the center tank). The Boeing "dark cockpit" approach is to not have lights illuminated on the overhead panel for normal conditions. If you look at the switches with electrical power on airplane but all pump switches off, the main tank boost pumps switches will have the PRESS lights illuminated but the center tank pump switches will not. If the center tank pump switch is on but the pump output pressure is low due to lack of fuel or a pump failure, the PRESS light will be illuminated.
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Old 25th Oct 2020, 06:51
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Originally Posted by Dave Therhino View Post
It's been 20 years since I was in the cockpit of a 777 (as an engineer in flight testing - not a pilot) but here is what I recall. Hopefully someone else can confirm or correct this.

The PRESS light on the fuel pump switches means low pressure. However, unlike the main tank boost pumps, the center tank pump low pressure lights are inhibited if the pump switches are off because normal operation of the airplane includes operation with those switches off (after the center tank is depleted of if there is no mission fuel in the center tank). The Boeing "dark cockpit" approach is to not have lights illuminated on the overhead panel for normal conditions. If you look at the switches with electrical power on airplane but all pump switches off, the main tank boost pumps switches will have the PRESS lights illuminated but the center tank pump switches will not. If the center tank pump switch is on but the pump output pressure is low due to lack of fuel or a pump failure, the PRESS light will be illuminated.
this sounds right for the 787, which I believe is the same as the 777.
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Old 25th Oct 2020, 11:39
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During normal preflight, I check overhead amber lights as 6832!

Electrical panel- 4 OFFs, 2 DRIVEs, total 6 amber lights.
Hydraulic panel- 8 FAULTs
Fuel panel- 3 PRESSs ( With AC power available and the APU selector in the ON position, the left forward fuel pump operates automatically regardless of switch position, therefore no PRESS light illuminated)
Bleed Air panel- 2 OFFs


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Old 25th Oct 2020, 11:43
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Remember this. Somewhere further down the line, your checkers will mess with your overhead panel pushbuttons before your sim check
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Old 26th Oct 2020, 20:36
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Originally Posted by flightleader View Post
Remember this. Somewhere further down the line, your checkers will mess with your overhead panel pushbuttons before your sim check
why hyd 8?
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Old 26th Oct 2020, 21:20
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On the 787 it should be 8 amber lights on the electrical panel and 6 on the hydraulic - every generator has their own drive light. I see that is different on the 777.

edit: And the 777 hydraulic system does indeed have 8 fault lights vs 6 on the 787 upon further review.
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Old 26th Oct 2020, 23:39
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Because there are 8.
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