Mechanic reports an annual inspection of their cessna-172 noted the airworthiness directive (ad) to ...

Attributes
ACN	809795
Time
Date	200810
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Person 1
Affiliation	other
Qualification	technician : powerplant technician : airframe
Experience	maintenance technician : 20
ASRS Report	809795
Events
Anomaly	maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : briefing performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : inspection
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Airworthiness directive 2008-05-09 seat back support bracket could crack; causing seat back to fail. It was missed on 2 previous 100 hour inspections (first on may/xa/08; second on jul/xa/08) causing plane to fly over airworthiness directive by about 170 hours. It was caught on annual inspection on oct/xa/08 causing plane to be grounded until parts came in nov/08. No cracks were noted at this time. To prevent this problem from happening again; I will be doing airworthiness directive checks at every 100 hour inspection; and not just waiting for annual inspection. Callback conversation with reporter revealed the following information: reporter stated the airworthiness directive (ad) 2008-05-09 involved inspecting the pilot and co-pilot's seat back support bracket for cracks that could cause the seat back to fall backwards (aft). Reporter stated this ad only applies to certain seat backs with specific serial numbers on cessna 172 aircraft and possibly other cessna model aircraft. No cracks were found on their cessna. Reporter stated since the missed inspections; they have contracted with a maintenance tracking software company that will provide an update of all airworthiness directives in a clearance delivery format every two weeks.

Original NASA ASRS Text

Title: MECHANIC REPORTS AN ANNUAL INSPECTION OF THEIR CESSNA-172 NOTED THE AIRWORTHINESS DIRECTIVE (AD) TO INSPECT THE PILOT AND CO-PILOT'S SEAT BACK SUPPORT BRACKETS FOR CRACKS HAD BEEN MISSED ON TWO PREVIOUS; 100 HOUR INSPECTIONS.

Narrative: AIRWORTHINESS DIRECTIVE 2008-05-09 SEAT BACK SUPPORT BRACKET COULD CRACK; CAUSING SEAT BACK TO FAIL. IT WAS MISSED ON 2 PREVIOUS 100 HR INSPECTIONS (FIRST ON MAY/XA/08; SECOND ON JUL/XA/08) CAUSING PLANE TO FLY OVER AIRWORTHINESS DIRECTIVE BY ABOUT 170 HRS. IT WAS CAUGHT ON ANNUAL INSPECTION ON OCT/XA/08 CAUSING PLANE TO BE GNDED UNTIL PARTS CAME IN NOV/08. NO CRACKS WERE NOTED AT THIS TIME. TO PREVENT THIS PROB FROM HAPPENING AGAIN; I WILL BE DOING AIRWORTHINESS DIRECTIVE CHKS AT EVERY 100 HR INSPECTION; AND NOT JUST WAITING FOR ANNUAL INSPECTION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE AIRWORTHINESS DIRECTIVE (AD) 2008-05-09 INVOLVED INSPECTING THE PILOT AND CO-PILOT'S SEAT BACK SUPPORT BRACKET FOR CRACKS THAT COULD CAUSE THE SEAT BACK TO FALL BACKWARDS (AFT). REPORTER STATED THIS AD ONLY APPLIES TO CERTAIN SEAT BACKS WITH SPECIFIC SERIAL NUMBERS ON CESSNA 172 AIRCRAFT AND POSSIBLY OTHER CESSNA MODEL AIRCRAFT. NO CRACKS WERE FOUND ON THEIR CESSNA. REPORTER STATED SINCE THE MISSED INSPECTIONS; THEY HAVE CONTRACTED WITH A MAINTENANCE TRACKING SOFTWARE COMPANY THAT WILL PROVIDE AN UPDATE OF ALL AIRWORTHINESS DIRECTIVES IN A CD FORMAT EVERY TWO WEEKS.

Data retrieved from NASA's ASRS site as of May 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Mechanic reports an annual inspection of their cessna-172 noted the airworthiness directive (ad) to inspect the pilot and co-pilot's seat back support brackets for cracks had been missed on two previous; 100 hour inspections.