PS Magazine - MARCH 1974

PS, The Preventative Maintenance Monthly

ISSUE 256

MARCH 1974

PS Magazine - MARCH 1974 - Page 20 of 35
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Dear Specialist
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Appendix
Vóó
of TM 5-823±4 (²pr 66) oN aIrFeld³helIport operat´Onal and mainteµ
.
naNce facIlities has the word on constructINg a compass rose, The pub does Not havE
the Info on how often it's caliBrated¶ tho·
The ¸ederal ²viation ²¹minIstRatIon has pUbl´shed ²dvisory Circular ºUmber
150/5325»8 (8 May 69)¶ Compass CalibratIoN Pad¼
¶·
Para
7
of ½e circular says each of .the
12 radials¶ at ¾0¿degree intervals¶ must be
orieNted with´n one minute of the magÀ
netÁc bearing indicated by its markIngsÂ
MagHetIc surveys of the pad should Ãe
done by the eng´neers everY 5 yearsÄ More
frequent calibrat´oN should be doNe
ô
you
have major consÅucÆ´on¶ such as UtIliÇy
lINes and buildings¶ withiN 6ÈÉ feet of the
padÊ
¸t
·


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