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User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Posted (11 years 1 month 3 weeks 1 day 1 hour ago) and read 1967 times:

B737-Classic Aircraft

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



12 replies: All unread, jump to last
 
User currently offlineDirkSavage From , joined Dec 1969, posts, RR:
Reply 1, posted (11 years 1 month 3 weeks 1 day ago) and read 1943 times:

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

*No (or low) hydraulic quantity/pressure

*bad pressure switch



User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 2, posted (11 years 1 month 3 weeks 14 hours ago) and read 1831 times:

Actual Low Pressure condition, whether genuine or a bad switch is the first condition...
There is another cause.


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 3, posted (11 years 1 month 3 weeks 12 hours ago) and read 1800 times:

Standby rudder selected on the guarded "A" sys flt control switch.

User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 4, posted (11 years 1 month 3 weeks 12 hours ago) and read 1786 times:

No, the light is deactivated when the Flight Control switch is placed to Stby Rudder.

User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 5, posted (11 years 1 month 3 weeks 6 hours ago) and read 1723 times:

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.."
User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 6, posted (11 years 1 month 3 weeks 6 hours ago) and read 1720 times:

... 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.."
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 7, posted (11 years 1 month 3 weeks 4 hours ago) and read 1703 times:

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.


User currently offlineAaron atp From United States of America, joined Mar 2000, 533 posts, RR: 2
Reply 8, posted (11 years 1 month 3 weeks 3 hours ago) and read 1684 times:

failure of the flight control module


User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 9, posted (11 years 1 month 3 weeks 3 hours ago) and read 1677 times:

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.."
User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 10, posted (11 years 1 month 3 weeks 2 hours ago) and read 1665 times:

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.."
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 11, posted (11 years 1 month 3 weeks 2 hours ago) and read 1649 times:

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


User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 12, posted (11 years 1 month 3 weeks 1 hour ago) and read 1643 times:

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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