efohdee
Posts: 212
Joined: Fri Oct 29, 2004 4:52 am

Compass Swing

Sat Jul 30, 2005 12:49 am

When is a compass swing due? I cant find anything in the FAR's. Yes I can understand the reasons when avionics or the compass is replaced. But I was told it is due anytime an engine is changed, after structural repair.
 
G4Doc2004
Posts: 120
Joined: Thu Feb 19, 2004 7:49 am

RE: Compass Swing

Sat Jul 30, 2005 2:23 am

If an aircraft is on a AAIP program, it's done annually. On smaller aircraft, it is done at the annual inspection. On newer aircraft with EFIS and flux valves, you can simply do a correlation check against the compass rose on the MFD.
"Failure to prepare is preparing to fail"--Benjamin Franklin
 
air2gxs
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Joined: Mon Jun 18, 2001 1:29 pm

RE: Compass Swing

Sat Jul 30, 2005 7:32 am

Quoting Efohdee (Thread starter):
But I was told it is due anytime an engine is changed, after structural repair

Never done one after an engine change or after any structural repair. I've done it after replacing the standby compass. And, I believe we do them at "c" check.

Of course, I'm talking ATC aircraft.
 
efohdee
Posts: 212
Joined: Fri Oct 29, 2004 4:52 am

RE: Compass Swing

Sat Jul 30, 2005 11:54 am

Just wanted to know cause I got it wrong on a test. The question "they" had was: When is a compass swing due? After engine change, airframe repair, 12 months, or all the above. Their answer was all of the above. I didn't argue but i asked others later and the response was "what type aircraft?" For a UH-1 yes but others it all depends on the manual, situation, etc.
The questions are written by my employer, and the tests are not very well concieved. It is a brief window into their limited views(we do multiple platforms). My days there are numbered. With the current state of aviation maintenance in the US it might be awhile.
 
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HAWK21M
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Joined: Fri Jan 05, 2001 10:05 pm

RE: Compass Swing

Sat Jul 30, 2005 2:53 pm

During a C of A Inspection [Once a yr Calender period].
Or If Snag exists.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
DC8FriendShip
Posts: 235
Joined: Fri Apr 29, 2005 7:35 pm

RE: Compass Swing

Sat Jul 30, 2005 11:58 pm

According to the FARs, (I believe it's somewhere in 43), it's due at least evry 24 months, or when an equipment change is made.
Come fly the Friendly Skies of United
 
avioniker
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Joined: Tue Jan 01, 2002 5:38 am

RE: Compass Swing

Mon Aug 01, 2005 9:52 pm

A compass swing is only required when there's reason to question the accuracy of the system or a repair or replacement is made that could cause an error.
It may also be required if your company changed the compensation card style.
There's no time requirement unless it's written into your company's maintenance procedures manual.
Or I missed something in 43, 91, 121, or 135. I didn't look in any others.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
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HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Compass Swing

Tue Aug 02, 2005 12:17 am

Quoting Avioniker (Reply 6):
It may also be required if your company changed the compensation card style.

What is meant by style.Pls elaborate.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: Compass Swing

Tue Aug 02, 2005 4:14 am

Cards may be incremented in 10 or more degrees per compensation correction. If you are currently using a card with corrections every 15 degrees and change to a card with 10 degree increments you'll have to go to the rose and do a swing to determine the compensation for each heading.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
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HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Compass Swing

Tue Aug 02, 2005 8:14 pm

Quoting Avioniker (Reply 8):

Ok Understood.
Thanks.
regds
MEL
I may not win often, but I damn well never lose!!! ;)

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