Safety Advisory Notice SAN20010223

Safety Advisory Notice issued to: Civil Aviation Safety Authority

Recommendation details
Output No: SAN20010223
Date issued: 24 October 2001
Safety action status: Closed
Background: Why this Safety Advisory Notice was developed

Output text

The Civil Aviation Safety Authority note the safety deficiency identified in this report relating to single-engine Cessna aircraft seat stops and, as a matter of some urgency, alert aircraft owners, aircraft maintenance engineers and pilots to the potentially dangerous consequences of using other than the specified seat stops and to the importance of correctly locating those seat stops and ensuring that the seat pin securely engages a locating hole on the rail.

Initial response
Date issued: 12 December 2001
Response from: Civil Aviation Safety Authority
Response text:

I refer to your letter of 18 October 2001 enclosing a copy of draft Aviation Occurrence Brief 200104684, concerning an accident involving Cessna 172 VH-ECT. CASA has the following comments on the report.

CASA conducted a desktop audit following the accident in order to determine if there had been any regulatory breaches leading up to the accident. All documentation available to the inspectors concerning the aircraft, flying school and the particular flight appeared to be in order.

Following the accident brief of VH-ECT being released on the ATSB website, CASA inspectors contacted local maintenance organisations to make them aware of the possible use of non-approved methods to secure Cessna 100/200 series seat stops.

AD/Cessna/170/53/Amdt2 Issue 13/88 concerns the seat adjustment mechanism in Cessna 172 aircraft. There is a Cessna modification kit available to enable the rear stops to be moved rearwards to provide easier rear access to the aircraft.
Maintenance organisations have reported that there has been evidence of the rear stops being unofficially relocated aft. It appears that the maintenance organisations are in the habit of reversing such unofficial relocations, but are not in the habit of reporting the practice to help prevent its recurrence. No problems with the forward stops were reported.

CASA undertakes to provide further publicity on the problems and consequences of using other than serviceable, specified seat stops on these types of aircraft.
Thank you for bringing this matter to the attention of the Authority.

ATSB Note: CASA published an article "Not so Merry Go-around" in Nov-Dec 2001 edition of Flight Safety Australia.

Last update 01 April 2011