EASA AD US-2026-20-02
Master Minimum Equipment List - Amendment
Summary
The Master Minimum Equipment List - Amendment is a final rule airworthiness directive issued by the FAA affecting The Boeing Company Model 787-8 and 787-9 airplanes equipped with certain Rolls-Royce Deutschland Ltd & Co KG Trent 1000 engine variants. It addresses a safety concern related to the lack of data supporting engine operability when dispatched under MMEL item 75-33-01, which involves operating with an inoperative engine intermediate pressure bleed valve (IPBV).
What Changed
This new airworthiness directive prohibits dispatching Boeing 787-8 and 787-9 airplanes under the operator's minimum equipment list procedures corresponding to MMEL item 75-33-01 for engine intermediate pressure bleed valves. It effectively removes the allowance to operate with one inoperative IPBV on each engine due to insufficient data on engine performance and safety under such conditions.
Why It Matters
This directive is critical for aviation professionals because it addresses a potential unsafe condition that could lead to loss of engine thrust control and consequent loss of airplane control. Operators and maintenance teams must ensure compliance to avoid dispatching aircraft with inoperative IPBVs, thereby maintaining safe engine operation and preventing catastrophic failures.
What To Do
Operators of affected Boeing 787-8 and 787-9 airplanes must cease dispatching aircraft under MMEL item 75-33-01 starting 60 days after the effective date of October 14, 2026. Compliance with this prohibition is mandatory to mitigate the risk of engine thrust control loss. Stakeholders should review their minimum equipment lists and operational procedures to align with this directive and submit any comments to the FAA by November 13, 2026.
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