8 Table 3. Example of a Completed Compass Correction Worksheet (Optional) (Column 1)
DESIRED
HEADING (Column 2)
AIRCRAFT
COMPASS
READING (Column 3)
REFERENCE
COMPASS SYSTEM (Column 4)
AIRCRAFT
COMPASS ERROR (Column 5)
AIRCRAFT
COMPASS
CORRECTED N 356 359 -3 357 30 032 034 -2 028 60 062 063 -1 059 E 088 086 +2 092 120 125 121 +4 124 150 150 148 +2 152 S 177 175 +2 182 210 213 213 0 210 240 245 246 -1 239 W 268 270 -2 268 300 300 297 +3 303 330 333 335 -2 328 Table 4. Sample Compass Correction Card FOR
HEADING 000 030 060 090 120 150 STEER Radio On Radio Off 357 357 028 028 059 059 092 092 124 124 152 152
FOR
HEADING 180 210 240 270 300 330 STEER Radio On Radio Off 182 182 210 210 239 239 268 268 303 303 328 328 Note: The figures used in the “STEER” sections were numbers taken from Table 3.
9 Table 5. Blank Compass Correction Card Example FOR
HEADING 000 030 060 090 120 150 STEER Radio On Radio Off
FOR
HEADING 180 210 240 270 300 330 STEER Radio On Radio Off
Table 6. Placard Requirements Each calibration reading must be in terms of magnetic headings in not more than 30° increments OR not more than 45° increments.
Must show the calibration of the instrument in level flight with the engines operating.
Must state whether the calibration was made with radio receivers on.
Must state whether the calibration was made with radio receivers off.
If a magnetic nonstabilized direction indicator can have a deviation of more than 10 degrees caused by the operation of electrical equipment.
Must state which electrical loads, or combination of loads, would cause a deviation of more than 10 degrees when turned on.
§ 23.2610 – < 30° Increments § 23.2610 § 23.2610 § 23.2610 § 23.2610 § 23.2610 § 25.1547(d) – < 45° Increments § 25.1547(b) § 25.1547(c) § 25.1547(c) NA NA § 27.1547(d) – < 45° Increments § 27.1547(b) § 27.1547(c) § 27.1547(c) § 27.1547(e) § 27.1547(e) § 29.1547(d) – < 45° Increments § 29.1547(b) § 29.1547(c) § 29.1547(c) NA NA Note: A placard meeting the preceding requirements must be installed on or near the magnetic direction indicator.
10 11 DOCUMENTATION. A placard (correction card) must be installed on, or near, the magnetic direction indicator. There are several different versions of correction cards available. Table 5, Blank Compass Correction Card Example, contains a blank compass correction card that can be printed out, filled in, and sized to fit the card holder in the aircraft. See Table 6, Placard Requirements, to determine the specific placard requirements for your aircraft.
11.1 Logbook Entry. A compass calibration is a maintenance action and requires an entry in the maintenance records for the aircraft.
12 AC FEEDBACK FORM. For your convenience, the AC Feedback Form is the last page of this AC. Note any deficiencies found, clarifications needed, or suggested improvements regarding the contents of this AC on the Feedback Form.
ORIGINAL SIGNED by /s/ John Barbagallo Deputy Director, Flight Standards Service
Advisory Circular Feedback Form If you find an error in this AC, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by contacting the Flight Standards Directives Management Officer at 9-AWA-AFB-120-Directives@faa.gov.
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