439AWI21-101 — Functional/operational Check Flight And High Speed Taxi Checks

439AWI21-101 governs procedures for controlling functional check flight, operational check flight, and high-speed taxi programs.

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  • Publication number: 439AWI21-101
  • Title: FUNCTIONAL/OPERATIONAL CHECK FLIGHT AND HIGH SPEED TAXI CHECKS
  • Date: 2025-08-04

View 439AWI21-101 on armypubs.army.mil


It covers aircraft maintenance evaluations, FCF and OCF requirements, aircrew coordination, briefing, scheduling, documentation, and Weight and Balance review. It requires compliance with specified Technical Orders and states that Westover does not perform high speed taxi checks.

Applies to: This applies to the 439th Operations Group Commander (439 OG/CC), 439th Operations Squadron, Airfield Management (439 OSS/OSA), 439th Airlift Wing, Command Post (439 AW/CP) and all of the Maintenance Group (439 MXG) work centers.

Topics covered

  • Functional Check Flights
  • Operational Check Flights
  • Aircraft maintenance evaluations
  • Check flight aircrew coordination
  • FCF Coordination Checklist
  • High speed taxi checks

Questions and answers

Which aircraft maintenance situations require evaluation for an FCF or OCF?

Aircraft being recovered from cannibalization status, isochronal inspections, Contract or Depot Field Team, or other major repair will be evaluated to determine if a FCF or OCF is required based on the type and degree of maintenance performed. (paragraph 1)

Are WARB aircrews qualified to perform check flights?

WARB aircrews are not qualified to perform Check Flights (to include OCF, In-Flight Operational Check (IFOC) and FCF) except for items specified in Air Force Manual (AFMAN) 11-2C-5V3, C-5 Operations Procedures, 20 October 2022 and AFMAN 11-2C-5V3_439AWSUP. (paragraph 1)

What determines when FCFs are conducted?

FCFs will be conducted as determined by requirements in Technical Order (T.O.) 1-1300, Maintenance Operational Checks and Check Flights, 1C-5M-6, Scheduled Inspections and Maintenance Requirements, and as directed by the 439 MXG/CC. (paragraph 2)

What must 439 MXG/MXQ do for FCF coordination?

The 439 MXG/MXQ will utilize the FCF Coordination Checklist (Attachment 2), maintain an information file for briefing aircrews, ensure aircraft Weight and Balance (W&B) documents are reviewed prior to FCF, and document all FCF/OCF. (paragraph 2)

How much notice is required for scheduling an OCF?

The Maintenance Group Plans, Scheduling and Documentation (439 MXG/MXOP) Supervisor will provide the 439 OG with a minimum of 24-hours notification to ensure a smooth transition and for scheduling the most qualified aircrew to complete the required checks. (paragraph 3)

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