Heat/Defog Valve; Heat/Defog Valve Removal; Heat/Defog Valve Installation - MD Helicopters MD Explorer Servicing And Maintenance

CSP−900RMM−2

2. Heat/Defog Valve

A. Heat/Defog Valve Removal
(Ref. Figure 401)
(1). Open landing light window panel N82,
panel N106 and center access panel
B142 (Ref. Section 06-00-00).
(2). Remove cotter pin (1), washers (2) and
clevis pin (4) and disconnect heat/defog
control cable clevis (3) from heat/defog
valve (5).
NOTE:
Avoid damage to insulation during re­
moval if possible. Reuse insulation on
installation.
(3). Remove and discard tape (19) and
remove insulation (18) from heat/defog
tube assembly (11) and heat/defog valve
(5).
(4). 900 CONFIG - Disconnect flexible
coupling assembly (16) and retainer (6)
from heat/defog valve to heat/defog
tube assembly.
(5). 900 CONFIG - Remove and discard
seal(s) (15) from heat/defog valve (5)
and heat/defog tube assembly (11).
(6). 900 CONFIG - Disconnect flexible
coupling assembly (16) and retainer (6)
from heat/defog valve to heat/defog
ejector (7) and remove valve.
(7). 900 CONFIG - Remove and discard
seal(s) (15) from heat/defog valve (5)
and heat/defog ejector (7), retain spacer
fitting (17).
(8). 902 CONFIG - Disconnect coupling
nut (22) from heat/defog valve to
heat/defog tube assembly.
(9). 902 CONFIG - Disconnect coupling
nut (22) from heat/defog valve-to-heat/
defog ejector (7) and remove valve.
Page 402
Original
MD Helicopters, Inc.
Rotorcraft Maintenance Manual
21-40-00
B. Heat/Defog Valve Installation
(Ref. Figure 401)
Consumable Materials
(Ref. CSP−SPM)
Item Nomenclature
Foam (900 CONFIG)
C801
Tape, Adhesive (900 CONFIG)
C709
Rubber, Expanded (902 CONFIG)
C610
Tape, Glass Fabric (902 CONFIG)
C710
(1). 900 CONFIG - Install threadless
flexible coupling seal with cup facing
tube end (Ref. Section 21-40-00).
(2). 900 CONFIG - Install spacer fitting,
connecting heat/defog valve to heat/de­
fog ejector with retainer and flexible
coupling.
(3). 902 CONFIG - Install coupling nut,
connecting heat/defog valve to heat/de­
fog ejector. Torque nut.
(4). 900 CONFIG - Connect heat/defog
valve to heat/defog tube assembly with
retainer and flexible coupling.
(5). 902 CONFIG - Connect heat/defog
valve to heat/defog tube assembly
coupling nut. Torque nut.
NOTE:
Wrap tube connections with insulation
and tape. Overlap the existing insulation on
tube and line assemblies one inch.
(6). Install insulation (18) over tube
connections and wrap with tape (19).
(7). Connect heat/defog control cable to
heat/defog valve with clevis pin,
washers and cotter pin.
(8). Close landing light window panels N82,
panel N106 and center access panel
B142 (Ref. Section 06-00-00).