Sometimes an aircraft or component has a safety problem that requires all other aircraft of the same type to be checked. To achieve that, the Director issues an airworthiness directive (AD). The CAA issues new and amended ADs monthly, but emergency ADs can be issued at any time.
The AD is prompted by a recent investigation which determined that the Airworthiness Limitation Section (ALS) for the model AS 350 BB helicopter did not include a life limit or a repetitive inspection requirement for the affected part.
This condition, if not corrected, could result in an extended in-service use, consequent failure of an affected part and loss of aircraft control.
Prompted by this finding, Airbus Helicopters issued AS 350 Emergency Alert Service Bulletin (ASB) 05.00.97, which introduces a Service Life Limit (SLL) and appropriate mandatory inspections for the affected part when installed on the AS 350 BB.
This AD mandates the implementation of the SLL, the repetitive inspections and, depending on findings, accomplishment of applicable corrective action(s).
EC 120 B helicopters, all serial numbers - effective 01 Nov 2019
The initial inspection of the tail rotor hub body on EC 120 B helicopters mandated by EASA AD 2019-0272-E must be accomplished by an aircraft maintenance engineer.
The repetitive inspection per mandatory action (1) in EASA AD 2019-0272-E, which is required at intervals not to exceed 15 flight hours or 7 days, whichever occurs first, may be accomplished by adding the inspection requirement to the helicopter tech log. The visual inspection may be performed and certified under the provision in Part 43 Appendix A.1 (7) by the holder of a current pilot licence, if that person is rated on the aircraft, appropriately trained and authorised (Part 43, Subpart B refers), and the maintenance is recorded and certified as required by Part 43.
If any cracks are found, then an aircraft engineer must accomplish the corrective actions per the EASA AD 2019-0272-E before further flight.
ARRIUS 1A and ARRIUS 1A1 engines, all serial numbers (s/n) - effective 29 Oct 2019
This UK MPD is applicable to non type-certified Rotax 912 i series and Rotax 915 i A series engine.
Affected engines are fitted with a fuel pump assembly P/N 889696 (part of assembly P/N 889697), or P/N 889698 (part of assembly P/N 889699) with a S/N from 180500 through to 192699 inclusive.
Rotax 912 iSc2 Sport, 912 iSc3 Sport and Rotax 915 iSc3 A engines, all S/N fitted with fuel pump assemblies P/N 889696 (part of assembly P/N 889697), or P/N 889698 (part of assembly P/N 889699) with a S/N from 180500 through to 192699 inclusive.