Is your heading off?
#1
Is your heading off?
From the FAASafety Team:
Your Aircraft Systems May be Vulnerable
Notice Number: NOTC4031
https://www.faasafety.gov/files/notices/2012/Aug/CAUTION_TLP_031612_Rev10.pdf
USMCFLYR
Note - I've seen this every once-in-awhile.
I think Mountain Home, AR was the last time I can remember.
Your Aircraft Systems May be Vulnerable
Notice Number: NOTC4031
!!! CAUTION !!!
Magnetic disturbances or magnetic flux fields propagated by underground/buried or surface objects made of steel can cause significant directional heading errors in slaved compass system(s) indications . . .
Magnetic disturbances or magnetic flux fields propagated by underground/buried or surface objects made of steel can cause significant directional heading errors in slaved compass system(s) indications . . .
- Many low-wing airplanes, including some regional airliners, as well as helicopters, are susceptible to magnetic disturbances caused by buried- and surface-objects containing or made of steel
- Directional heading errors have contributed to loss of separation between aircraft during initial departure and subsequently caused the issuance of pilot deviations
- Such errors have been documented to be up to 40 degrees
- Errors in heading may be indicated on one or both installed slaved directional indicators (HSI, EHSI, PND, etc.) which MAY or MAY NOT be detectable and alerted to the pilot by a comparator monitor, if installed
- Heading error indications vary in magnitude and may be observable in the same or different directions, depending upon flux field density
https://www.faasafety.gov/files/notices/2012/Aug/CAUTION_TLP_031612_Rev10.pdf
USMCFLYR
Note - I've seen this every once-in-awhile.
I think Mountain Home, AR was the last time I can remember.
#4
New Hire
Joined APC: Aug 2012
Position: Computer Desk
Posts: 2
See it all the time on our Dash 8's Usually corrects is self as soon as you rotate. If it doesn't you can turn on the SAHAS for a bit with the flux valve in the tail rather than the wing it usually solves the problem in the Dash 8.
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