Page 71.6 Chapter 71 Powerplant R66 Maintenance Manual SEP 2012
71-11 Preparing Engine for Rolls-Royce Maintenance Facility
Refer to R66 Illustrated Parts Catalog (IPC) Chapter 71.
NOTE
Cap and plug Rolls-Royce engine model 250-C300/A1 engine
fluid ports, electrical connectors, etc., and in removed
components, progressively during procedure to prevent foreign
object contamination.
1. Refer to Figures 71-1 and 71-2. Remove hardware securing (2) MS21919WCH14 clamps
to Rolls-Royce engine model 250-C300/A1 engine vertical firewall and F577-5 bracket.
Loosen B277-8 clamp and remove A785-36 hose and F170-1 fitting. Install plug.
2. Refer to Figure 76-1. Remove F147-1 (minimum throttle stop) screw and D930-2
spring from fuel control unit.
3. Refer to Figure 71-4. Remove hardware securing F169-2 base and F577-5 bracket to
exhaust collector. Remove base and bracket, and install exhaust collector cover.
4. To remove F049-09 harness assembly:
a. Disconnect F049-09 harness assembly’s plug from engine magnetic plug on bottom
of engine accessory gearbox.
b. Remove hardware securing harness wire terminal to igniton exiter box stud.
c. Cut and discard ty-raps as required, and disconnect G426-1 (fuel differential
pressure) switch assembly wire from harness at connectors. Cut and discard
stand-off ty-raps at switch wire and F741-1 line assembly.
d. Remove hardware securing (2) MS21919WCH4 clamps to (bottom of) engine gearbox.
e. Disconnect harness plugs from anti-ice valve assembly solenoid, anti-ice pressure
switch assembly, and N
1
speed pick-up assembly.
f. Remove hardware securing (2) MS21919WCH4 clamps to (2) engine-supplied
MS9592-050 brackets.
g. Remove hardware securing harness wire terminals to measured gas temperature
(MGT) thermocouple studs.
h. Disconnect harness plug from engine magnetic plug near oil line unions.
i. Cut and discard ty-raps as required, and disconnect D745-3 pressure switch
assembly from harness at connectors.
j. Remove hardware securing F577-1 and F577-3 bracket assemblies to (right side
of) engine gearbox. Remove harness.
5. Remove engine inlet bellmouth per Section 71-23 Part A steps 2 and 3.
6. Disconnect F741-1 line assembly from G426-1 switch assembly and fuel pmp’s A919-
0D reducer and remove line.
7. Disconnect F727-1 line assembly from fuel pump’s A919-2D reducer. Disconnect
F727-2 line assembly from engine fireshield’s drain fitting. Remove hardware securing
MS21919WCH4 clamp the combustion section’s plug flange and remove lines.
To Next Page
Loading...