cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

Another Pop Quiz

Wed Oct 08, 2003 12:53 pm

B737-Classic Aircraft

Name the 2 causes of an illuminated System "A" Flight Controls Low Pressure Light.

 
Guest

RE: Another Pop Quiz

Wed Oct 08, 2003 1:33 pm

Just a guess...........assuming no wiring problems.

*No (or low) hydraulic quantity/pressure

*bad pressure switch

 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Another Pop Quiz

Wed Oct 08, 2003 11:30 pm

Actual Low Pressure condition, whether genuine or a bad switch is the first condition...
There is another cause.
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: Another Pop Quiz

Thu Oct 09, 2003 1:24 am

Standby rudder selected on the guarded "A" sys flt control switch.
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Another Pop Quiz

Thu Oct 09, 2003 1:38 am

No, the light is deactivated when the Flight Control switch is placed to Stby Rudder.
 
dc10hound
Posts: 460
Joined: Fri Dec 15, 2000 4:18 pm

RE: Another Pop Quiz

Thu Oct 09, 2003 7:48 am

When the standby system rudder shutoff valve is closed and the system "A" flight control switch is "OFF".
"Eagles soar. But weasels never get sucked into jet intakes.."
 
dc10hound
Posts: 460
Joined: Fri Dec 15, 2000 4:18 pm

RE: Another Pop Quiz

Thu Oct 09, 2003 7:50 am

... orsystem "A" is low pressure (You asked for two conditions, I only supplied one in my first post...).
"Eagles soar. But weasels never get sucked into jet intakes.."
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Another Pop Quiz

Thu Oct 09, 2003 9:56 am

OK...last try

With the Flight Control System "A" switch in it's normal position & the aircarft powered normally, what 2 conditions can cause the System "A" Flt Ctrls Low pressure light to illuminate.

The first condition has already been stated. An actual low pressure condition (includes malfunctioning pressure switch). There are no wiring problems.
 
aaron atp
Posts: 517
Joined: Sun Mar 19, 2000 1:17 pm

RE: Another Pop Quiz

Thu Oct 09, 2003 10:21 am

failure of the flight control module
 
dc10hound
Posts: 460
Joined: Fri Dec 15, 2000 4:18 pm

RE: Another Pop Quiz

Thu Oct 09, 2003 10:54 am

The bright/dim/test switch on the P1-3 panel is selected to "TEST".

The system "A" flight control low pressure light module L3 is pressed (to test).

failure of the flight control module

That could be correct, if the system "A" flight control low pressure light module L3 is stuck in.


"Eagles soar. But weasels never get sucked into jet intakes.."
 
dc10hound
Posts: 460
Joined: Fri Dec 15, 2000 4:18 pm

RE: Another Pop Quiz

Thu Oct 09, 2003 11:18 am

Mr Boeing sez:

"Each flight control low pressure light monitors the position of the standby rudder shutoff valve when the flight control switch is in the STDBY RUD position."


"When the flight control switch is in the STDBY RUD position, the low pressure warning switch is not connected to the low pressure light. When the standby rudder shutoff valve is in the closed position, the valve position relay provides a ground to the low pressure light. When the standby rudder shutoff valve moves to the open position, the valve position relay energizes and removes the ground to the low pressure light."

"Eagles soar. But weasels never get sucked into jet intakes.."
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Another Pop Quiz

Thu Oct 09, 2003 12:04 pm

CdfMxTech sez:

The question is with the Flight Controls System "A" switch in the normal position, which is "A" ON.

OK, the answer:

Post AD 97-14-03 (Yaw Damper System Modification) which was due for completion in 2000

The Yaw Damper Coupler can turn the System "A" light ON in the even that pressure to the Main Rudder PCU is less than 500 psi or when full pressure is commanded to the RPR and system pressure is less than 2,200 psi.

If you want to see what Mr. Boeing sez about this, Ref AMM 22-12-01  Big thumbs up
 
dc10hound
Posts: 460
Joined: Fri Dec 15, 2000 4:18 pm

RE: Another Pop Quiz

Thu Oct 09, 2003 12:48 pm

B737-Classic Aircraft

If I don't learn to pay attention to detail, I'll never get anywhere in dis biz...
 Big thumbs up

If you want to see what Mr. Boeing sez about this, Ref AMM 22-12-01

"My" (AAL) AMM doesn't have a 22-12-01. The airline doesn't have B737 Classics either....

Whoops.  Smile/happy/getting dizzy

Nice quiz tho, Cdfmx...

 Smokin cool




"Eagles soar. But weasels never get sucked into jet intakes.."

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