MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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Page 902
Revision 7
95-10-10
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Neither this document nor any part hereof may be reproduced or transferred to
other documents or used or disclosed to others for manufacturing or any other
purpose except as specifically authorized in writing by MD Helicopters, Inc.
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1999 − 2016 by MD Helicopters, Inc.
0.84
±
0.02 IN.
(21.336
±
0.508 MM)
CL FUSELAGE
FULL R
(2 PLACES)
POINT A
1.01
±
0.02 IN.
(25.654
±
0.508 MM)
EXISTING CUTOUT
RC22 GROMMET
DOWN
G95-1010A
Figure 901. Canopy Panel Grommet Hole Modification (All Models)
(8). Reinstall switch panel into instrument
panel.
C. Canopy Panel Modification
The heated pitot tubes are larger than the
nonheated type, so the hole in the canopy
panel must be enlarged. The original grommet
must be replaced with one that can withstand
the heat. Dimensions are provided for the
enlarged hole.
(1). Carefully remove original grommet.
(2). Elongate existing hole an equal amount
above and below existing hole center
(Ref. Figure 901).
(3). Increase width of hole an equal amount
both sides of existing hole center.
(4). Prepare area around hole to receive
new grommet.
(5). Install grommet (Ref. Canopy Panel
Grommet Replacement (Procedure
Using A-4000 Adhesive) or Canopy
Panel Grommet Replacement (Proce­
dure Using Silastic 140 Adhesive)).
NOTE:
Save leftover bonding compound for use
in creating airtight seal between grommet
and pitot tube later (Ref. Heated Pitot Tube
Installation).
D. Doubler Installation (Round Nose)
(Ref. Figure 902) Examine Figure 902 careful­
ly. Note that pitot tube will pass through
elongated hole in doubler off center. It is
absolutely necessary that the doubler be
located on the web so the heated pitot tube
will be aligned as closely as possible with the
longitudinal axis of the helicopter when the
heated pitot tube is extended through the
grommet in the canopy panel.
(1). Remove original unheated pitot tube
(Ref. Pitot Tube Assembly Replace­
ment) and carefully position doubler on
inner crew compartment, side of web of
instrument panel lower support
assembly, so position key on doubler
will be engaged with notch in rear of
heated pitot tube as shown.
NOTE:
Key on doubler must be located in lower
left portion of hole when viewed from front
of helicopter.
(2). Drill three 0.062 inch (1.5749 mm) pilot
holes, using a 1/16 inch (1.5875 mm)
drill bit, in web to match holes in
doubler.