MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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96-48-00
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1999 − 2016 by MD Helicopters, Inc.
(2). Verify FLOAT LDG LT circuit breaker
switch (CB140) is closed (push in).
(3). Set LDG LT, FLOAT LT switch (S32) to
FLOAT LT and verify both float lamps
are on.
(4). Set switch S32 to LDG LT and verify
landing light is on. Set switch S32 to
OFF.
(5). Set master switch to OFF.
10. Lamp Assembly Adjustment
(Ref. Figure 203 and Figure 204)
The left and right float lamp assemblies must
be adjusted for a beam angle of 20 degrees and
40 degrees, respectively, below horizontal.
Normally, the helicopter has a nose-up
attitude while standing. The amount of
inclination must be measured, with a machin­
ist's inclinometer or other suitable instrument,
so this factor of inclination can be compen­
sated for when setting the lamp beam angles.
The measured angle of inclination will be a
positive number. The desired angles of the
lamp beams are negative numbers: -20
°
and
-40
°
. To calculate the resultant angles at
which the lamps must be set, simply apply the
principle for the addition of signed numbers.
Example:
Assume helicopter inclination is +10
°
-20
°
+10
°
= -10
°
left lamp resultant angle
-40
°
+10
°
= -30
°
right lamp resultant angle
NOTE:
One convenient point for measuring the
helicopter inclination is the passenger com­
partment floor.
(1). Because the 4550 lamp lens is convex, a
method must be improvised for achiev­
ing a flat surface for the inclinometer.
One inexpensive method is as follows:
(a). Tape together one end of two six-
inch, or longer, metal rules which are
exactly the same width.
(b). Apply rules across lamp retainer, as
shown, so inclinometer can be placed
vertically over lens.
(c). Apply inclinometer vertically across
rules, and adjust lamp to proper
computed angle.
(d). Tighten fasteners and recheck lamp
angle.
NOTE:
An alternate method of lamp adjust­
ment is to remove the lamp per Float Lamp
Replacement to eliminate the convex sur­
face, and simply apply the inclinometer ver­
tically across the open face of the lamp hous­
ing.
11. Float Lamp Inspection
(Ref. Figure 203) Because of the limited
average service life of the 4530 lamps (10
hours), the operator should consider maintain­
ing a record of usage so the lamps can be
replaced before they fail. A record of operating
time should be incorporated into the regular
aircraft inspection log.
Before commencing an inspec­
tion or repair, ensure that mas­
ter switch (S2) and LDG LT, FLOAT LT
switch on pilot's collective stick are set to
OFF.
(1). Inspect lenses for cleanliness.
(2). Inspect lenses for cracks. Replace lamp
with cracked lens per Float Lamp
Replacement.
(3). Check beam angles. Left lamp: -20
degrees. Right lamp: -40 degrees.
(4). Inspect seal of wire harness at lamp
housing.
(5). Inspect seal of lamp joints.
(6). Inspect grommet at buntline -2.50
(Figure 201).
(7). For 369D; 001 & subs, and 369E;
001-383:
(a). Inspect connection of wire L522H10
to terminal 4 of terminal board
TB101.
(8). For 369E; 384 & subs, 500N; 001 &
subs, and 600N; 003 & subs:
(a). Inspect connection of wire L522H10
to Bus 2.
CAUTION