SDR 97ZZZX192

Service difficulty report · Air Filter · Cessna 421C

Difficulty date: December 16, 1996
Submitted: March 26, 2000
Operation: General aviation
Aircraft: N88604
Make and model: Cessna 421C
Aircraft serial: 421C0604
System (JASC): 2130 · Cabin Pressure Control System
Part: Air Filter
Part number: 99100181
Condition: Failed
Location: Heat Exchange
Part time: 3,147 hours
Component: 511725811
Stage of operation: IN
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

CABIN PRESSURIZATION WEAK, INSPECTED PRESSURIZATION HEAT EXCHANGER IN WING. BOTH EXCHANGERS PLUGGED WITH FELT MATERIAL. SUSPECT FELT MATERIAL CAME FROM ENDS OF PAPER AIR FILTERS. VACUUM AND CLEANED HEAT EXCHANGERS, TEST FLIGHT CHECK, AND NORMAL.

More about the Cessna 421C