TM 11-4920-292-15
Optical transfer setup for Induction compass Transmitter T-611/ASN
or DT-809/AJN in U-1A, U-6, U-8D, and U-21 aircraft.
plumb bob separation on line E-1 of the swing
(1) Tow the aircraft into position with the
data sheet.
centerline of the aircraft located as directly as
possible over the north-south line established
(4) Measure the lateral displacement of
during the area magnetic survey, The nose of
lines E-2 and E-3 of the swing data sheet.
the aircraft must be at north heading. The
NOTE
compass transmitter access must be directly
If this displacement is west of the
over the turntable location.
north-south line, it shall have a nega-
(2) Remove the plumbline from the align-
tive value, and if it is east, a positive
ment equipment case.
value.
(3) Drop the plumb line from the aircraft
(5) Algebraically subtract the lateral dis-
centerline at the nose and tail. Mark the points
placement at the tail from the lateral dis-
where the plumb bob comes to rest. With the
placement at the nose and record on line E-4
measuring tape, measure the distance between
these two points. Record this distance as the
of the swing data sheet.
9-12
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