TM 11-4920-292-15
T-611/ASN in CH-54 aircraft.
to the aircraft terminal strip in accordance with
the procedures applicable to the aircraft and
the aircraft technical manual.
compass system being calibrated. Table 9-1
defines reference numbers. In sequence, perform
(3) Set the control console switches as
only the procedures which are applicable to the
follows :
compass system aircraft combination that is to
(a) E1 NORM.-E1 REV. : El NORM.
be calibrated.
(b) E2 NORM.-E2 REV. : E2 NORM.
(c) AREA COMP to value on line A-6
b. Perform one-cycle error compensation for
of swing data sheet.
Reference Nos. 1,2,4, 6, or 7 as follows:
(d) E1 CHECK-E2 CHECK: OFF.
(1) Connect the compass calibrator to the
(e) ∆180 MINUTES and polarity to
aircraft compass transmitter in accordance
value on line D-3 of swing data sheet.
with figure 9-14 for reference Nos. 1, 2, 4, or
(f) ∆270 MINUTES and polarity to
6. Temporarily mount the magnetic compen-
value on line D-4 of swing data sheet.
sator with the rubber gasket on the compass
(g) MODE SELECTOR : MON.
(h) HEADING SELECTOR : 0 DE-
(2) Connect the compass calibrator to the
GREES.
aircraft wiring in accordance with figure 9-15
for reference No, 7. Mount the magnetic com-
(i) FV SELECT:
pensator on the ML-1 and connect ML-1 leads
1. For ML-1: 1.
9-16
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