Commonwealth legislation

AD/AMD 50/45 - Wing Primary Structure

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of Falcon 50 aircraft to carry out non‑destructive testing (NDT) of the wing lower panel stiffeners between ribs 13 and 17 using Maintenance Procedure MP 57‑401 (via Temporary Change 74). Inspections are due at 14,200 flight cycles since new and must be repeated every 5,350 cycles.

The directive says the inspections respond to a risk of structural impairment after possible wing overpressure caused by corroded fuel‑tank relief valves; operators pay the inspection and scheduling costs and must meet the stated intervals (Requirement, Compliance, Background).

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AMD Falcon 50 and 900 Series Aeroplanes

AD/AMD 50/45	Wing Primary Structure	4/2008

Applicability:	Model Falcon 50 aircraft, all serial numbers.
Requirement:	Perform Maintenance Procedure MP 57-401 Non-Destructive Test inspection of the wing lower panels stiffeners between ribs 13 and 17.Note 1: Maintenance Procedure MP 57-401 is introduced through Temporary Change 74 of the Mystere-Falcon Aircraft Maintenance Manual.Note 2: EASA AD 2008-0021 refers.
Compliance:	Upon the accumulation of 14,200 flight cycles since new. Repeat thereafter at intervals not to exceed 5,350 flight cycles.
	This Airworthiness Directive becomes effective on 10 April 2008.
Background:	An analysis of in-service events revealed that corrosion of wing fuel tank pressure relief valves was likely to occur well before reaching the overhaul time. This situation could result in valves stuck in the closed position. There is the possibility that some aircraft could have experienced wing overpressure with the latent failure of both valve units. An overpressure, although not sufficient to cause static damage, could have impaired the fatigue damage tolerance of the wing structure.

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David Villiers
Delegate of the Civil Aviation Safety Authority

26 February 2008

AD/AMD 50/45

Wing Primary Structure

4/2008

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

AMD Falcon 50 and 900 Series Aeroplanes AMD Falcon 50 and 900 Series Aeroplanes

AMD Falcon 50 and 900 Series Aeroplanes

AD/AMD 50/45	Wing Primary Structure	4/2008

Applicability:	Model Falcon 50 aircraft, all serial numbers.
Requirement:	Perform Maintenance Procedure MP 57-401 Non-Destructive Test inspection of the wing lower panels stiffeners between ribs 13 and 17.Note 1: Maintenance Procedure MP 57-401 is introduced through Temporary Change 74 of the Mystere-Falcon Aircraft Maintenance Manual.Note 2: EASA AD 2008-0021 refers.
Compliance:	Upon the accumulation of 14,200 flight cycles since new. Repeat thereafter at intervals not to exceed 5,350 flight cycles.
	This Airworthiness Directive becomes effective on 10 April 2008.
Background:	An analysis of in-service events revealed that corrosion of wing fuel tank pressure relief valves was likely to occur well before reaching the overhaul time. This situation could result in valves stuck in the closed position. There is the possibility that some aircraft could have experienced wing overpressure with the latent failure of both valve units. An overpressure, although not sufficient to cause static damage, could have impaired the fatigue damage tolerance of the wing structure.

AD/AMD 50/45 - Wing Primary Structure

Plain English Summary

Deep dive

Current sections

AMD Falcon 50 and 900 Series Aeroplanes

AMD Falcon 50 and 900 Series Aeroplanes

AD/AMD 50/45

AD/AMD 50/45

Wing Primary Structure

Wing Primary Structure

4/2008

4/2008

Source text

AMD Falcon 50 and 900 Series Aeroplanes AMD Falcon 50 and 900 Series Aeroplanes

AMD Falcon 50 and 900 Series Aeroplanes

AD/AMD 50/45 AD/AMD 50/45

AD/AMD 50/45

Wing Primary Structure Wing Primary Structure

Wing Primary Structure

4/2008 4/2008

4/2008