allowable compass error...

§ 23.1327 Magnetic direction indicator.
(a) Except as provided in paragraph (b) of this section-

(1) Each magnetic direction indicator must be installed so
that its accuracy is not excessively affected by the
airplane's vibration or magnetic fields; and

(2) The compensated installation may not have a deviation in
level flight, greater than ten degrees on any heading.

(b) A magnetic nonstabilized direction indicator may deviate
more than ten degrees due to the operation of electrically
powered systems such as electrically heated windshields if
either a magnetic stabilized direction indicator, which does
not have a deviation in level flight greater than ten
degrees on any heading, or a gyroscopic direction indicator,
is installed. Deviations of a magnetic nonstabilized
direction indicator of more than 10 degrees must be
placarded in accordance with §23.1547(e).

[Amdt. 23-20, 42 FR 36969, July 18, 1977]


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--
James H. Macklin
ATP,CFI,A&P

"Casey Wilson" N2310D @ gmail.com wrote in message
news:0sylg.2531$DI2.2291@trnddc05...
| Okay, Jim, I think you said an error greater than ten
degrees will ground
| the airplance. I'll accept that. Can you give me the
reference for the ten
| degree figure? Are you saying that the airplane should be
taken to the
| compass rose during the annual or is there some "quick
check?"
|
| "Jim Macklin" wrote
in message
| news:NBplg.49163$ZW3.16236@dukeread04...
| Part 23 and Part 43.
|
| Runways are to the nearest 5 degrees and will be
renumbered
| as required. During the annual inspection the compass
| should be checked to be sure it is within degrees on all
| headings and any time there has been a change in the
| airplane that would cause the deviation to change.
|
|
| Yes, an error greater than 10 degrees, even with the
| correction card, requires correction.
|
|
| --
| James H. Macklin
| ATP,CFI,A&P
|
| "RomeoMike" wrote in
message
| ...
| | Don't know, but if you are using the runway heading to
| judge whether
| | your compass reading is in error, remember that runway
| headings are not
| | always true. There are other ways to calibrate your
| compass.
| |
| | Casey Wilson wrote:
| | My FARAIM is at my daughter's house and I can't find
| anything on the 'net to
| | answer my questions. Please indulge me....
| |
| | Scenario:
| | 1) line up with runway centerline[for my
| hypothetical, the runway is
| | dead nuts to the compass]
| | 2) note compass heading
| | 3) add/subtract compass card correction
| |
| | Questions:
| | 1) How much error is allowable between known
heading
| and corrected
| | compass reading?
| | 2) Does a significant error down the airplane as
| unworthy?
| | 3) Where can I find applicable references?
| |
| |
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