MD Helicopters CSP-900RMM-2, Servicing And Maintenance

Page: 1183 / 2144

CSP − 900RMM − 2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 421
Revision 24
53-30-00
B. Forward Duct Installation
(Ref. Figure 411)
Consumable Materials
(Ref. CSP − SPM)
Item Nomenclature
C417 Release Agent
C419 Alcohol, Isopropyl
C209 Sealing Compound, Dichromate Cured
C701 Lockwire
NOTE:
Steps (1). and (2). apply only if forming
a new seal. If the original seal is not dam­
aged, start with step (3)..
(1). Prepare fairing-to-fairing and fairing-
to-deck contact surfaces of ducts (3 and
7), drive shaft cover (19) and underside
of upper deck for installation.
Alcohol, Isopropyl (C419)
(a). Wipe contact surfaces with a clean,
lint free cloth dampened in isopropyl
alcohol (C419).
(b). Wipe surfaces before alcohol dries.
(c). Allow to air dry for a minimum of ten
minutes.
Release Agent (C417)
(d). Apply release agent (C417) to contact
surfaces of cover (19) and fore and aft
sections of duct assembly (3 and 7).
Allow releasing agent to dry before
applying sealant.
(2). Set aft section of duct assembly (3)
aside for later installation.
Sealing Compound (C209)
NOTE:
Do not apply sealant in nutplate re­
gions of duct assembly or drive shaft cover.
(3). Attach drive shaft cover (19) to the
underside of upper deck.
(a). Apply a coat of sealing compound
(C209) to contact surface of drive
shaft cover (19).
(b). Align cover with nutplates in upper
deck.
(c). Secure cover to deck with bolts (5)
and washers (6). Torque bolts.
(4). Attach forward section of duct assembly
to underside of upper deck.
(a). Apply sealing compound (C209) to
contact surface of forward section of
duct assembly (7).
(b). Align duct assembly (7) with holes in
upper deck and nut plates in middle
duct assembly.
(c). Secure duct (7) to deck with bolts (5)
and washers (6). Torque bolts.
(d). Wipe off excess sealing compound
from edges of duct assembly.
(5). Install wire harness W130 with
grommet through hole at center of duct
assembly.
(a). Move wire harness (18) connector
P390 through grommet to approxi­
mate length of 7.10 in. forward of
duct assembly.
(b). Secure grommet into duct assembly
(7).
(c). Attach connector P390 to receptacle
J390 . Safety with lockwire (C701).
(d). Seal wire harness and grommet to
duct assembly using sealing com­
pound (C209).
(6). Install right half of fan fairing/center­
body assembly.