17. When should a Direct Indicating Compass be “swung”?
When should a Direct Indicating Compass be “swung”?
I have information stating 'change of mag lat' and 'lightning strike' but would appreciate more information. Humorous reasons also welcomed. Thanks in advance. |
I guess the relevant maintenance schedules will list the occasions when a direct reading compass must be reswung but a few spring to mind:-
Whenever there is a significant change in a/c components which might affect deviation - eg new wing etc! At certain calendar periods (two years ?) Whenever the correct operation of the compass is in doubt - pilot report in tech log? Hope this helps a little |
The full list which we teach is:
a when compass componenets are installed or replaced b whenever the accuracy of the compass is in doubt c after a maintenance inspection, if required by the schedule d after a significant aircraft modification, repair or replacement involving magnetic material e when carrying unusual ferromagnetic payloads f when the compass has bee exposed to significant shock (heavy landing?) g if the aircraft has been struck by lightning! h after significant modifications to the aircraft radio or electrical system i if the aircraft has been in long term storage standing on one heading j if a change to a new theatre of operations involves a large change of magnetic latitude (though quite honestly, I don't think this one has much application in practice - after all they don't re-swing an aircraft compass on every turn-round on long-haul from UK to Singapore and back!) |
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