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CESSNA C172 SDR # 20040423010
Wire Harness Behind Radio Panel Chafed
A pilot reported that the flight controls of his Cessna 172R were "stiff and very hard to move" during run-up prior to departure, and the pilot elected to return to base.
The AMO found a wire harness behind the radio panel chafing on the throttle mount causing an electrical short to ground. This caused the auto-pilot servo to engage uncommanded.
FAIRCHILD SA227DC SDR # 20040507004
Hydraulic Supply Line Chafed
During flight, the right hydraulic pressure annunciation went from intermittent to continuous. Prior to landing, when flaps and gear were selected, further loss of hydraulic pressure was experienced. The auxiliary gear extension procedure was carried out and the gear locked down for an uneventful landing.
Post-flight inspection revealed hydraulic oil on the underside of the aircraft. Maintenance discovered a chafed hole in a hydraulic supply line in the right wing leading edge inboard of the nacelle. The line was subsequently replaced.

 

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Transport Canada (TC) endeavours to send copies of new airworthiness directives (ADs), which are applicable in
Canada to the registered owners of the affected products. Equipment/appliance ADs are often only distributed to our
regional offices because the owners of aircraft affected by this type of AD are not generally known.
The following new ADs on equipment have been received by TC in the last three months. AMEs and operators of the

affected products are encouraged to obtain further information or a copy of the ADs from their regional TC office,

their local TCC, their PMI, or from the Civil Aviation AD website at:

http://www.tc.gc.ca/civilaviation/certification/continuing/ad.htm

The submitters of the following Service Difficulty Reports (SDRs), received during the previous quarter, indicated thatan unapproved part (SUP) was suspected. The list is provided here for information only and should not be construedas an identification of confirmed unapproved parts. In Canada, SUPs should be reported indicating your suspicion ofan unapproved part on a regular SDR form or on the Internet at: www.tc.gc.ca/wsdrs

 

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