71-20 Induction
CAUTION
Never operate engine without G057-1 cage assembly installed.
F771-1 filter assembly not required for flight.
CAUTION
Do not perform maintenance near engine inlet without either a
filter assembly or a temporary cover installed on G057-1 cage
assembly. Contact Rolls-Royce Customer Support if foreign
objects enter inlet.
71-21 Air Filter Assembly
Refer to R66 Illustrated Parts Catalog (IPC) Figure 71-9.
NOTE
Replace F771-1 air filter assembly “on-condition”.
A. Removal
1. Remove tailcone cowling assembly per Section 53-23. Open main rotor gearbox
compartment access door.
2. Refer to Figure 71-3. Vacuum exterior of F771-1 filter assembly.
3. Disconnect F049-08 (air filter switch) electrical harness plug from F059-01 (cabin)
harness at G258-4 strap.
4. Loosen B277-4 clamp securing A729-42 tube to G738-1 nozzle; pull tube off of
nozzle.
5. Pull filter forward off of G057-1 cage assembly.
B. Installation
1. Refer to Figure 71-3. Pull F771-1 filter assembly aft over G057-1 cage assembly.
2. Install B277-4 clamp and A729-4 tube onto G738-1 nozzle and tighten clamp. Verify
security.
3. Connect F049-08 (air filter switch) electrical harness plug to F059-01 (cabin) harness
at G258-4 strap.
4. Turn BATTERY switch ON. To test air bypass warning circuit, verify annunciator
panel warning segment illuminates when bypass doors are opened individually, then
simultaneously. Turn BATTERY switch OFF.
5. Install tailcone cowling assembly per Section 53-23. Close main rotor gearbox
compartment access door.
6. Perform compressor rinse per RR300 Series Operation and Maintenance Manual (OMM).
SEP 2012 R66 Maintenance Manual Chapter 71 Powerplant Page 71.11
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