71-20 Induction
NOTE
Refer to § 12-70 for (Engine) Compressor Rinse and Wash
procedures.
CAUTION
Never operate engine without G057-1 cage assembly installed.
F771-1 (foam) filter assembly not required for flight; 146150-
101 (inlet barrier filter) filter assemblies not required for flight.
CAUTION
Do not perform maintenance near engine inlet without cage and
filter(s) or a temporary cover installed. Contact Rolls-Royce
Customer Support if foreign objects enter inlet.
71-21 Air Filter Assembly
A. Description
The standard reticulated polyurethane foam filter is installed over the G057-1 cage
assembly (refer to § 71-22) and secured with locking cords. Filter should be removed
& cleaned with water when visibly dirty; replace filter if foam is visibly damaged or
deteriorated.
The optional G058-1 inlet barrier filter cage assembly is a separate installation with
additional parts that secure the filters to the G057-1 cage assembly and that secure
the assembly to the upper frame and firewall. A filter maintenance aid helps to
determine if cleaning is required earlier than scheduled (refer to Figure 71-4 and Parts
E and F); certain operating environments require more frequent cleaning. The inlet
barrier filter may be cleaned 15 times before replacement.
APR 2019 Chapter 71 Powerplant Page 71.11
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