Engine Fuel & Control - Metering Valve Pilot Valve - Removal / Replacement
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must remove and replace the MVPV in the specified fuel control units at the next FCU shop visit after December 3, 2018, the effective date of the AD. Replacement parts must be either new or repaired with a tamper proof feature on the end plugs. Operators should consult Pratt & Whitney Alert Service Bulletin PW2000 A73-172 dated October 16, 2017, for the list of affected FCUs and follow FAA guidance for compliance documentation.
Summary
Airworthiness Directive 2018-22-06 is a final rule issued by the Federal Aviation Administration addressing Pratt & Whitney PW2037, PW2037M, and PW2040 turbofan engines. It mandates the removal and replacement of the metering valve pilot valve (MVPV) within certain fuel control units to prevent uncommanded high thrust events. This directive targets engines installed on U.S. registered airplanes and aims to enhance flight safety by addressing a specific unsafe condition.
What changed
This new airworthiness directive requires the removal of the MVPV from affected fuel control units and its replacement with a part eligible for installation, which includes either a new or properly repaired MVPV featuring a tamper proof end plug. The AD clarifies repair allowances, compliance requirements, and updates references to service information and terminology to improve clarity and applicability.
Why it matters
This AD is critical for aviation professionals because it addresses a safety risk of uncommanded high thrust during critical flight phases caused by loosening of the MVPV end cap. Operators and maintenance organizations must ensure compliance to prevent potential loss of thrust control, thereby maintaining aircraft safety and regulatory compliance. Understanding repair limitations and part eligibility is essential for effective maintenance planning and cost management.
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