une explication svp

[maratsafin66]

Bonjour ,

Question:An aircraft's compass must be swung


reponse:if the aircraft has been subjected to hammering


je ne comprend pas le mot hammering dans cette question .

merci d'avance

[chuck_73]

hum, peut être un atterrissage dur, ou un choc

en zieutant divers site qui parle de cette question, depuis pprune,

http://www.pprune.org/tech-log/128138-1 ... swung.html
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!)