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Service Difficulty Advisory

AV 2001-03
28 March 2001

Hughes 369D

Collective Bungee Support Bracket

Transport Canada has recently received a Service Difficulty Report (SDR) on a broken bungee spring support bracket (located under the pilot's seat) which failed during long line slinging operations. The pilot heard a loud noise followed by a sudden up force on the collective pitch lever. The pilot was already on short final and an immediate landing was carried out.

This particular bracket (P/N 369A7339), made from magnesium, is an original part still in service and has a history of cracks and, in some cases, complete fracture.

The manufacturer had previously issued Service Bulletin DN 54.1 which recommended a one-time inspection and introduced an improved aluminum bracket better able to withstand the fatigue stresses of the pre-loaded bungee spring and the collective feedback loads from the main rotor.

The bracket is inspected at the 100-hour or annual inspection, thus Transport Canada strongly advises personnel to pay extra attention for cracks.

Arrow pointing to the broken area of a bungee spring support bracket

Further occurrences of cracking of these parts or any other defect should be reported by sending a Service Difficulty Report to Transport Canada, Continuing Airworthiness, Ottawa.

For further information, contact a Transport Canada Centre, or Mr. Barry Caldwell, Continuing Airworthiness, Ottawa, telephone (613) 952-4358, facsimile (613) 996-9178 or e-mail caldweb@tc.gc.ca.

For Director, Aircraft Certification

B. Goyaniuk
Chief, Continuing Airworthiness

Date modified:
2012-02-03

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