AF Form 4112: KC-135 Restraint Computation Worksheet

AF Form 4112: KC-135 Restraint Computation Worksheet – The AF Form 4112, officially titled the KC-135 Restraint Computation Worksheet, is a critical Air Force form used in cargo load planning for the KC-135 Stratotanker. It helps calculate the proper restraints (tie-downs, nets, chains, or straps) needed to secure cargo and equipment safely during flight. This ensures compliance with safety standards and prevents cargo from shifting under flight forces such as acceleration, deceleration, turbulence, or maneuvers.

Air Force loadmasters, boom operators, and cargo handlers rely on this worksheet as part of the overall load planning process, often alongside AF Form 4100 (KC-135 Load Planning Worksheet) and other documentation referenced in AFMAN 11-2KC-135 Volume 3.

Why AF Form 4112 Matters for KC-135 Operations?

The KC-135 Stratotanker serves primarily as an aerial refueling platform but also supports limited cargo and passenger transport. Depending on fuel configuration, it can carry up to approximately 83,000 pounds of cargo in its main deck area (fuselage stations roughly 440–1120). Palletized loads use HCU-7/E or HCU-15/C nets, with typical pallet limits around 6,000 lbs per position (up to 6 positions in standard configs).

Cargo must withstand specific g-forces (longitudinal, lateral, and vertical) without shifting. The AF Form 4112 provides a standardized method to compute the required restraint capacity based on:

  • Cargo weight
  • Dimensions and center of gravity
  • Attachment points
  • Type of restraint devices (straps, chains, nets)
  • Direction of potential movement (forward, aft, side, vertical)

Proper use of the form helps meet requirements in technical orders like T.O. 1C-135(K)A-9 (Cargo Loading Manual) and broader Air Force mobility guidance, including the Defense Transportation Regulation (DTR) Part III.

Key safety note: Inadequate restraint can lead to cargo shift, affecting aircraft center of gravity, structural integrity, and flight safety. Always cross-reference with current aircraft-specific technical orders and unit procedures.

Who Uses AF Form 4112?

  • Load Planners and Loadmasters: Primary users for calculating tie-down requirements.
  • Boom Operators: Often involved in supervising cargo handling on KC-135 missions.
  • Air Mobility Command (AMC), AFRC, ANG, and other MAJCOM personnel: Anyone involved in KC-135 cargo/passenger operations.

The form supports both training and operational missions, including aeromedical evacuations, passenger movements, and contingency cargo lifts.

How to Use the KC-135 Restraint Computation Worksheet? (AF Form 4112)

While the exact layout is detailed in the official PDF, the worksheet typically includes sections for:

  1. Cargo Description: Item name, weight, dimensions, and position in the aircraft.
  2. Restraint Calculations: Fields to compute required forces in forward, aft, lateral, and vertical directions using established g-load factors for the KC-135.
  3. Device Selection: Space to specify the number and type of restraints (e.g., cargo nets, chains, straps) and verify their rated capacity meets or exceeds computed requirements.
  4. Center of Gravity and Attachment Data: Entries for height of attachment points, effective lengths, and ratios for vertical restraint.
  5. Notes and Certifications: Signatures or verifier fields, plus any special remarks.

General Process (based on standard Air Force restraint computation practices):

  • Determine cargo weight and location.
  • Apply aircraft-specific load factors (g-forces) for each direction. Forward restraint is often the most demanding.
  • Calculate required restraint force: Force (lbs) = Weight (lbs) × g-factor.
  • Select and verify devices whose combined strength meets the calculated need in all axes.
  • Document everything on AF Form 4112 and integrate with the overall load plan (e.g., via DD Form 2130-14 for KC-135 or ICODES software when available).

Many units also use digital tools or the KC-135 Weight and Balance (WB) Application as a companion to the paper form.

Important: Always perform calculations conservatively. Round down capacities where required, and ensure vertical restraint limits (if applicable to specific devices) are respected.

Download the Official AF Form 4112

Official Download Link:
AF Form 4112 – KC-135 Restraint Computation Worksheet (PDF)

This is the current version hosted on the Air Force e-Publishing site. Always verify you are using the latest revision through the official e-Publishing portal, as forms can be updated.

For related forms:

  • AF Form 4100: KC-135 Load Planning Worksheet
  • AF Form 4075: Aircraft Load Data Worksheet

Best Practices and Compliance

  • Integrate with Broader Guidance: Follow AFMAN 11-2KC-135 Volume 3 (KC-135 Operations Procedures) for cargo and passenger handling. Chapter 13 covers relevant procedures.
  • Use ICODES When Possible: The Integrated Computerized Deployment System is preferred for generating load plans; fall back to manual forms as needed.
  • Joint Inspection and Verification: Cargo loads require proper joint inspection before flight.
  • Hazardous Cargo: Additional restrictions apply—reference specific chapters in AFMAN 11-2KC-135V3 and DTR.
  • Training: New personnel should receive instruction on restraint calculations during aircrew or load planning training pipelines.

Pro Tip for Load Planners: Practice with sample loads. The worksheet streamlines what can otherwise be complex math involving ratios for strap/chain angles and vertical components.

Common Questions About AF Form 4112

Q: Is AF Form 4112 still current?
A: Yes, it remains referenced in current KC-135 operations manuals (e.g., 2019–2020 editions of AFMAN 11-2KC-135V2/V3).

Q: Can I use software instead?
A: Many processes now incorporate the KC-135 WB Application or ICODES, but the AF Form 4112 is still used for manual restraint computations and documentation.

Q: Where do I find g-factors for the KC-135?
A: Refer to the aircraft Cargo Loading Manual (T.O. 1C-135 series) and unit supplements. Standard factors vary by direction and configuration.

Conclusion

The AF Form 4112 KC-135 Restraint Computation Worksheet is an essential tool for safe and compliant cargo operations on the KC-135 Stratotanker. Accurate use protects the aircraft, crew, and mission cargo while meeting rigorous U.S. Air Force standards.

For the most authoritative information, download the form directly from the official link above and consult the latest AFMAN 11-2KC-135 series publications on e-Publishing. Units should ensure all load planners are trained on current procedures.

Keywords: AF Form 4112, KC-135 restraint worksheet, KC-135 load planning, Air Force cargo restraint, KC-135 Stratotanker cargo, AFMAN 11-2KC-135, aircraft loadmaster forms.

This article is for informational purposes and is based on publicly available U.S. Air Force publications. Always refer to official sources and current technical orders for operational use. Last updated with references as of 2026.