SDR 99ZZZX4002

Service difficulty report · Spring · Boeing 737*

Difficulty date: September 17, 1999
Submitted: March 26, 2000
Operation: General aviation
Filed by: IU6R626N
Aero Controls, LLC
Make and model: Boeing 737*
System (JASC): 2722 · Rudder Actuator
Part: Spring
Part number: 69778551
Condition: Cracked
Location: Horiz Stabilizer
Part time: 30,412 hours
Component: 654997025
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

SPRINGS, P/N 69-77855-1, ARE BROKEN IN THE AUXILIARY BRAKE SYSTEM. IMPROPER HEAT-TREATING, AUSTENITE, FATIGUE, AND INCREASED SPRING OIL STRESSES. SPRINGS, P/N 69-77855-1, ARE TO BE REPLACED WITH P/N 69-77855-2 SPRINGS ON ACTUATOR ASSEMBLIES MANUFACTURED PRIOR TO S/N KEO1730 PER BOEING SL 737-SL-27-090-B.