This led the FAA to issue an Emergency Airworthiness Directive AD 2020-51, requiring inspections of the engine bleed air 5th stage check valve on each engine and replacement of the engine bleed air 5th stage check valve if any inspection is not passed. Corrosion of these valves on both engines could result in a dual-engine power loss without the ability to restart. If this valve opens normally at takeoff power, it may become stuck in the open position during flight and fail to close when power is reduced at top of descent, resulting in an unrecoverable compressor stall and the inability to restart the engine. Corrosion of the engine bleed air 5th stage check valve internal parts during airplane storage may cause the valve to stick in the open position. The FAA received four recent reports of single-engine shutdowns due to engine bleed air 5th stage check valves being stuck open. Many airlines are restarting flights following groundings related to the COVID-19 pandemic. FAA is requiring operators of Boeing 737 aircraft to inspect engine bleed air valves of aircraft that have been stored after several incidents of in-flight engine shutdowns.
#WESTINGHOUSE J34 TURBINE JET SOFTWARE#
Installation/Verification of MAX Display System (MDS) Software.Minimum Equipment List (MEL) Provisions for Inoperative Flight Control System Functions.Note: Boeing updated the FCC software to eliminate MCAS reliance on a single AOA sensor signal by using both AOA sensor inputs and changing flight control laws to safeguard against MCAS activation due to a failed or erroneous AOA sensor. Installation/Verification of Flight Control Computer (FCC) Operational Program Software (OPS).In short, the NPRM proposes the following steps to be taken before any 737 MAX will be allowed to operate revenue flights: To assist with the review of the proposed AD, the FAA also published their Preliminary Summary of the FAA’s Review of the Boeing 737 MAX (PDF). The NPRM is open for public comments with 45 days of publication. The NPRM proposes mandating a number of design changes. The FAA has issued a notice of proposed rulemaking (NPRM) for a Boeing 737 MAX airworthiness directive (AD) (PDF) as another step to clear the grounded Boeing 737 MAX jets for flight again. There will also be differences in training including that associated with the enhanced flight deck procedure.įiled under: Airworthiness Directives by Harro RanterĬomments Off on Canada introduces additional requirements to allow return to service of Boeing 737 MAX This feature will effectively reduce pilot workload given what has been learned from the two tragic accidents, and has been fully evaluated by Transport Canada’s flight test pilots. The Canadian design changes for the Boeing 737 MAX, compared to the U.S., will include an enhanced flight deck procedure that provides the option for a pilot-in-command to disable the “stick shaker” when the system has been erroneously activated by a failure in the angle of attack sensor system. This will allow for the return to service of the aircraft in Canada. It is complementary to the design and maintenance requirements of the Airworthiness Directive.Īs a final step in this process, Transport Canada will lift the existing Notice to Airmen (NOTAM) which prohibits the commercial operation of the aircraft in Canadian airspace on January 20, 2021. In addition to all reviews, and to provide additional assurances that all measures are in place, an Interim Order that indicates Transport Canada’s expectations and requirements for additional training for crew members was also issued for operators.
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This concludes the department’s review of the aircraft. On January 18, 2021, Transport Canada issued an Airworthiness Directive for the Boeing 737 MAX which outlines the required modifications to be made to the aircraft prior to a return to service in Canadian airspace.