Service difficulty report · Actuator · Cessna 550

Difficulty date
March 7, 2007
Submitted
March 7, 2007
Operation
General aviation
Aircraft
N797CW
Make and model
Cessna 550
Aircraft serial
0232
Aircraft time
8,177 hours, 7,431 cycles
Engine
Pwa JT15D4
Part
Actuator
Part number
65651412
Condition
Binding
Location
Elevator
Part time
8,177 hours, 7,431 cycles
Stage of operation
IN
How discovered
V
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

WHILE REPLACING TRIM ACTUATOR P/N 6565141-2 WITH WHAT MFG SAID WAS AN APPROVED SUB PART P/N 5565450-92. IT WAS FOUND THAT THE LOLLIPOPS (JACK SCREWS) WERE 5.5 INCHES LONG AND THE ORIGINAL LOLLIPOPS ARE 5.75 INCHES LONG. IF YOU LOOK AT THE COMPONENT MANUAL FOR THIS ACTUATOR 6565141-2 IT SHOWS 4 DIFF. DASH NUMBERS. -4 AT 5.5 INCHES, -7 AT 5.5 INCHES, -15 AT 4.85 INCHES, AND -21 AT 5.75 INCHES ALL WHICH IS TO THE SAME LOLLIPOP P/N. THE -92 ACTUATORS FITS UNITS 692 TO 924, WHILE OUR UNIT IS 232. MFG NEEDS TO FIX THESE P/NS AND CLEAR THE WAY THESE MANUALS ARE WRITTEN FOR CLARITY. TO MANY ACTUATORS ARE TO ANOTHER P/N WITH INCORRECT JACKSCREW LENGTHS.

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