AF Form 4108 C-130 Fuel Log: Download & Guide 2026 – The AF Form 4108, officially titled C-130 Fuel Log (also known as AF IMT 4108), is a specialized U.S. Air Force form designed to record and track fuel consumption, gage readings, weight data, and performance metrics for the C-130 Hercules aircraft. It provides an orderly method for documenting fuel usage and aircraft gross weight (GW) during operations.
This form remains a key tool for C-130 aircrews, particularly aircraft commanders and flight engineers, across various C-130 variants in Air Mobility Command (AMC) and other units. It supports safe fuel management, accurate record-keeping, and compliance with operational procedures outlined in publications like AFMAN 11-2C-130 series manuals.
What Is AF Form 4108 Used For?
Aircrews use the C-130 Fuel Log to:
- Record fuel gage pounds in individual tanks before and after flight segments.
- Track fuel on/offload, consumption, and remaining quantities.
- Document weight data, including operating weight, ramp fuel, and cargo/passenger weights.
- Log performance data such as cruise indicated airspeed (IAS), torque, engine fuel flow (lbs/hr), service ceilings, and drift-down speeds.
- Note any variances (VAR) between calculated and actual gage readings.
- Capture remarks for anomalies, maintenance notes, or mission-specific details.
The form helps verify fuel planning accuracy, monitor consumption against forecasts, and maintain precise aircraft weight and balance records — all critical for the C-130’s tactical and strategic airlift missions.
It replaced the obsolete AMC Form 796 (Jun 92) and carries the revision date 19990301, Version 2.
Who Uses AF Form 4108?
Primary users include:
- Aircraft Commanders (AC)
- Flight Engineers
- Other crew members involved in fuel management on C-130H, C-130J, and specialized variants (e.g., AC-130, HC-130, MC-130)
It appears in multiple C-130 operations manuals as a required or referenced form for fuel tracking.
How to Fill Out AF Form 4108? Step-by-Step Overview
The form uses a tabular layout with sections for header information, fuel gage readings (before/after), weight data, performance metrics, and remarks. Here’s a breakdown based on the official PDF structure:
Header Information
- DATE
- AIRCRAFT COMMANDER
- AIRCRAFT M/D/S (Mission Design Series)
- AIRCRAFT NUMBER
- FROM / TO (departure and destination)
- WING / SQUADRON
- ENGINEER (primary and additional if applicable)
Fuel Gage Pounds – Tank BEFORE
Record initial fuel quantities (in pounds) for:
-
- L AUX (Left Auxiliary)
-
- L EXT (Left External)
-
- R EXT (Right External)
-
- R AUX (Right Auxiliary)
- L FUSE / TOTAL ACFT (Left Fuselage and aircraft total)
- R FUSE (Right Fuselage)
Fuel On/Offload and Related Data
- Fuel added or removed
- Pax/Cargo offload (if applicable)
Performance and In-Flight Data
- Engine start/condition settings
- OATI (Outside Air Temperature Indicator)
- HP (Horsepower)
- Cruise IAS
- Torque
- Service ceiling (3-engine)
- Drift-down IAS
- ENG INST F/F LBS/HR (Engine Instrument Fuel Flow in pounds per hour for each engine and total)
Fuel Used and Remaining – AFTER Section
- Fuel used per tank or segment
- Fuel remaining
- Calculated gage readings
- End totals
- Variances (VAR) between calculated and actual values
- Total ceiling and extra gross weight entries
Weight Data
- Operating weight
- Ramp fuel
- Cargo weight
Remarks (Block 32)
Use this section (often on the reverse) for additional notes, discrepancies, or mission comments.
Tip: Always cross-reference with the specific aircraft flight manual (T.O. 1C-130 series), AFMAN 11-2C-130V3 (or variant-specific volumes), and your unit’s standard operating procedures. Fuel flow and weight calculations must align with approved planning tools like the C-130 Flight Data Worksheet.
Accurate entries help prevent fuel-related incidents and support post-flight analysis and conservation efforts detailed in Chapter 12 of relevant C-130 manuals.
Why Accurate Fuel Logging Matters for C-130 Operations?
The C-130 Hercules is renowned for its versatility in airlift, airdrop, and special operations. Proper use of AF Form 4108 contributes to:
- Fuel conservation and efficient planning
- Weight and balance compliance
- Safety through real-time monitoring of fuel state and performance
- Accountability for POL (Petroleum, Oil, and Lubricants) documentation
U.S. Air Force guidance emphasizes fuel planning components, enroute management, and reserves in AFMAN 11-2C-130 publications.
Official Download: AF Form 4108 PDF
Download the latest official version directly from the U.S. Air Force e-Publishing site:
→ AF Form 4108 C-130 Fuel Log PDF
This is the authoritative source. Always use the version hosted on e-publishing.af.mil for compliance. The form is fillable in many PDF viewers, but crews typically complete it manually or per unit policy during flight.
Note: Forms and procedures can be supplemented by MAJCOM or unit guidance. Check current AFMAN 11-2C-130V3 (and addenda) for the latest operational context, as some references date to 2023–2025 publications.
Related Forms and Resources
- AF Form 4116 — C-130 Flight Plan Record (often used alongside)
- C-130 Flight Data Worksheet
- DD Form 365-4 — Weight and Balance Clearance Form F
- AFMAN 11-2C-130 series (various volumes for H/J models and special missions)
For broader fuel planning, refer to Chapter 12 in AFMAN 11-2C-130HV3 or equivalent manuals, which cover fuel load components, planning profiles, and conservation techniques.
Need Help with C-130 Fuel Procedures?
Aircrews should consult their squadron Stan/Eval section, flight manuals, and current TOs for variant-specific guidance (e.g., C-130J vs. legacy H models). Fuel management differs slightly across configurations, especially with external tanks or special mission kits.
Keywords for further reading: C-130 fuel planning, AFMAN 11-2C-130, Hercules fuel log, USAF aircrew forms.
This guide is for informational purposes based on official U.S. Air Force sources. Always verify the most current procedures through official channels at e-publishing.af.mil and your chain of command. Safe flying!