AF Form 4091: KC-10 Flight Engineer Worksheet [Download]

AF Form 4091: KC-10 Flight Engineer Worksheet [Download] – The AF Form 4091, officially titled KC-10 Flight Engineer Worksheet, is a specialized U.S. Air Force form used by flight engineers assigned to the KC-10 Extender aerial refueling and transport aircraft. This worksheet helps record and calculate critical in-flight data to support safe and efficient operations during missions involving aerial refueling, cargo transport, and global mobility.

Although the KC-10 fleet has been retired from active U.S. Air Force service (with the final aircraft completing its last flight in 2024), the form remains relevant for historical reference, training materials, aircrew archives, and personnel studying legacy Air Mobility Command procedures. The official blank PDF is available for download directly from the Air Force e-Publishing site.

Download AF Form 4091 PDF

Official Source:
Download AF Form 4091 – KC-10 Flight Engineer Worksheet

This is the authoritative version hosted on the Department of the Air Force e-Publishing website. Always use official .mil sources for current or archived forms to ensure compliance with Air Force standards.

What Is the KC-10 Extender?

The KC-10 Extender is a tri-jet aerial tanker and cargo aircraft developed from the McDonnell Douglas DC-10. Operated by Air Mobility Command, it provided advanced global reach by combining aerial refueling with significant cargo and passenger capacity. Key capabilities included:

  • Refueling fighters, bombers, and other aircraft while carrying support personnel and equipment.
  • Aeromedical evacuation support using patient pallets.
  • Crew of four (pilot, co-pilot, flight engineer, and boom operator), with provisions for additional personnel on certain missions.

The flight engineer played a central role in managing complex systems, particularly fuel, performance calculations, and weight and balance—tasks supported by dedicated worksheets like AF Form 4091.

Purpose of AF Form 4091

Flight engineers use the KC-10 Flight Engineer Worksheet to document and compute various operational data during KC-10 missions. It serves as a practical tool for recording and calculating flight parameters in real time, helping ensure mission safety, fuel efficiency, and compliance with performance limits.

Primary uses include:

  • Logging mission-specific data points relevant to the flight engineer’s responsibilities.
  • Performing calculations for fuel management, performance, and systems monitoring.
  • Supporting overall crew coordination during ground and flight operations.

It is one of several KC-10-specific forms (often grouped with AF Form 4090 for flight plan and fuel log, AF Form 4089 for TOLD card worksheet, and others) referenced in KC-10 operating manuals and local supplements.

Who Uses AF Form 4091?

  • Qualified KC-10 Flight Engineers — The primary users, responsible for systems management, fuel planning, and performance oversight.
  • Instructor and evaluator personnel — For training and standardization in KC-10 aircrew programs.
  • Unit training and standardization offices — As reference material for legacy procedures or historical records.

The form aligns with guidance in publications such as AFMAN 11-2KC-10V3 (KC-10 Operations Procedures), which outlines flight engineer duties and references associated forms.

Key Sections and Typical Content

While the exact layout is best viewed in the official PDF, AF Form 4091 generally includes dedicated blocks for:

  • Mission identification and aircraft data.
  • Performance and weight/balance-related entries.
  • Fuel system monitoring and calculations.
  • In-flight systems status and logging fields.
  • Space for computations and remarks.

It functions as a mission data worksheet, allowing the flight engineer to track variables that affect aircraft handling, range, and refueling capability. Related forms (e.g., the KC-10 Fuel Planning Worksheet mentioned in current manuals) complement it for comprehensive fuel and performance management.

Note: Exact fields may vary slightly by revision. The version available via the provided link is the standard official template.

Context Within KC-10 Operations

In KC-10 procedures, the flight engineer manages critical systems after initial weight and balance (often via DD Form 365-4) is established. Worksheets like AF Form 4091 support ongoing monitoring during long-duration missions, fighter drags, cargo hauls, and refueling operations. They help integrate with broader tools such as:

  • AF Form 4090 (KC-10 Flight Plan and Fuel Log).
  • TOLD (Takeoff and Landing Data) computations.

These forms ensured accurate, auditable records for safety, post-flight debriefs, and regulatory compliance.

How to Access and Use Official Air Force Forms?

  1. Visit the Department of the Air Force e-Publishing website at www.e-publishing.af.mil.
  2. Search by form number (AF4091) or title.
  3. Download the PDF directly for printing or digital use where authorized.

For active-duty, reserve, or guard personnel, consult your unit’s standardization/evaluation office or flight manuals for specific guidance on form usage. Legacy forms like this one may appear in training syllabi or historical studies of Air Mobility Command operations.

  • AFMAN 11-2KC-10V3 — KC-10 Operations Procedures (available on e-Publishing).
  • KC-10 Fact Sheet (archived on af.mil) — For aircraft specifications and mission overview.
  • Other KC-10 forms: AF Form 4090, AF Form 4095 (Load Planning), and evaluation worksheets.

Important: The KC-10 Extender has been retired from U.S. Air Force service, with the last aircraft retired in 2024. Forms and manuals associated with the platform are now primarily archival or used for educational purposes. Always verify the latest guidance through official Air Force channels for any operational or training needs.

If you need the AF Form 4091 for research, training review, or personal records, download it from the official link above. For questions about current tanker operations (e.g., KC-135 or KC-46), refer to the latest Air Mobility Command publications on e-Publishing.

This article is for informational purposes and references publicly available U.S. Air Force sources. Procedures and form usage must follow current directives and unit policies.