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
Page 903
Revision 11
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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.
Copyright
©
1999 − 2016 by MD Helicopters, Inc.
(16). With both doublers held securely in
place by Cleco fasteners, drill remain­
ing rivet holes in doublers as follows:
Insert drill bit into existing
holes in structure from below to
start new holes. Do not attempt to start new
holes from inside engine bay. Minute inaccu­
racies will cause new holes to be out of toler­
ance.
(a). Drill holes for MS20470AD3 and
MS20615M3 rivets with #41 drill bit.
(b). Drill holes for MS20615M4 rivets
with #30 drill bit.
NOTE:
To complete the following operation, re­
move 369H6006 brace assemblies (Ref. Sec.
32-00-00).
(c). Scribe hole center marks for eight
NAS1424 lockbolts.
(d). Drill one pilot hole through helicopter
structure for each flange of
369D292032-1 and -2 brackets. Use
#41 drill bit.
(e). Deburr pilot holes as required.
(f). Set left and right brackets in final
assembly position and tape brackets
securely.
(g). Recheck measurements of bracket
positions after taping and correct as
required.
(h). Mark hole centers on brackets
through pilot holes in helicopter
structure with machinist blue Dykem
paint (CM814). Allow paint to dry 10
to 15 minutes before removing
brackets for drilling.
(i). Remove brackets, dimple center of
blue markers and drill one pilot hole
on each flange. Use #42 drill bit.
(j). Deburr pilot holes.
(k). Install brackets in final assembly
position with Cleco fasteners, careful­
ly recheck position measurements.
G96-4011A
STA.
136.94
BL
00.20
0.062 IN. (1.5748 MM)
PILOT HOLE (2 PLCS)
Figure 902. Float Lamp Doubler Alignment
Details
(l). When brackets are properly posi­
tioned, carefully drill six more pilot
holes for lockbolts through helicopter
structure where scribed. Use #42
drill bit.
(m). Check brackets and doublers for
proper positioning once again.
(n). When brackets and doublers are
properly positioned, scribe center
marks for clamps.
(o). Drill 0.205 inch holes with #5 drill
bit.
(p). Scribe hole center for grommet on left
doubler only.
(q). Drill grommet hole with 7/16 inch
drill bit.
(r). Remove all Cleco fasteners and
deburr all holes as required.
NOTE:
Drilling and deburring make it neces­
sary to touch up and refinish the parts and
the helicopter structure. All metal surfaces
shall be re-primed with acrylic lacquer
(CM305), to match color number 20371, the
engine bay shall be repainted insignia white
to match color number 17875 and the exteri­
CAUTION