AF Form 1165: Monthly High Temperature Water Plant Operating – U.S. Air Force civil engineering and facility maintenance teams rely on AF Form 1165 to track high-temperature water (HTW) plant performance. This official monthly operating log ensures compliance, optimizes efficiency, and supports safe operation of critical heating systems at bases across the United States.
Whether you manage boiler plants at a CONUS installation, prepare for inspections, or need accurate records for environmental reporting, this guide covers everything about AF Form 1165. You’ll learn its purpose, how to complete it step-by-step, why it matters for USAF compliance, and where to download the latest fillable PDF instantly.
What Is AF Form 1165?
AF Form 1165, titled Monthly High Temperature Water Plant Operating Log, is a standardized two-page Air Force form used exclusively for recording monthly operational data from high-temperature water generator plants operating above 160 psig.
It consolidates daily data collected on AF Form 1163 (Daily High Temperature Water Plant Operating Log) into a single monthly summary. The form tracks key metrics such as:
- Fuel consumption
- Water circulation
- Combustion efficiency
- Overall plant efficiency
- Makeup water usage
The current version is dated 20170208 (February 8, 2017), and previous editions are obsolete. It remains the required form under current Department of the Air Force guidance.
Purpose of AF Form 1165 and Governing Regulations
Air Force heating plants must maintain detailed operating logs for safety, efficiency, environmental compliance, and equipment longevity. AF Form 1165 serves as the official monthly record for HTW plants with pressures exceeding 160 psig.
It is prescribed by AFMAN 32-1068, Heating Systems and Unfired Pressure Vessels (16 June 2020), which consolidated and superseded the earlier AFI 32-1068. This manual requires accurate logging to:
- Monitor plant performance and calculate monthly efficiencies
- Support air quality permit compliance and emissions reporting
- Enable proactive maintenance and troubleshooting
- Provide auditable records for Base Civil Engineer (BCE) review and higher headquarters inspections
Separate logs are required for each individual HTW plant. Data must be reviewed and signed by the Boiler Operations Supervisor and the Base Civil Engineer (or delegate). Records are typically retained for at least five years per AFMAN 32-1068 and related records management guidance.
Accurate use of AF Form 1165 helps USAF facilities reduce fuel costs, prevent downtime, and maintain full compliance with federal and DoD standards.
Key Sections and Fields on AF Form 1165 (How to Fill It Out)
The form is designed for easy posting from daily AF Form 1163 logs. Here’s a clear breakdown of every section:
Header Information (Items 1–4)
- Item 1: Command
- Item 2: Base and Location
- Item 3: Building
- Item 4: Month/Year (e.g., JAN 2026)
Daily Data Table (Days 1–31)
- Item 5 – Fuel: Record type (G = Gas, O = Oil, C = Coal) and quantity (Mcf for gas, gallons for oil, pounds for coal). Use Remarks section for multiple gases.
- Item 6 – Water Circulated: Supply temperature (°F) and daily gallons circulated (per generator and plant total).
- Item 7 – Efficiency Analysis Data: Oxygen (%), Stack ∆T (°F), and combustion efficiency (ηc) per generator.
- Item 8 – Recovery: Expansion tank pressure (psig), daily makeup water (gallons), and makeup %.
- Item 9 – Plant Daily Totals: Output (MMBtu), plant combustion efficiency, and overall efficiency.
Monthly Summary (Items 10–14)
- Item 10: Total Fuel Used (monthly totals by type)
- Item 11: Plant Input (MMBtu) – sum of daily inputs
- Item 12: Plant Output (MMBtu) – sum of daily outputs
- Item 13: Plant Combustion Efficiency (ηc-Plant) – average of daily values (0.xxx)
- Item 14: Plant Overall Efficiency (ηPlant) – calculated as Output ÷ Input (0.xxx)
Signatures and Remarks
- Boiler Operations Supervisor signature and date
- Base Civil Engineer (or delegate) signature and date
- Remarks section for additional notes (multiple fuels, anomalies, etc.)
Tips for Accurate Completion:
- Post data directly from completed AF Form 1163 each day.
- For plants with more than four generators, use additional sheets.
- Use the conversion factors printed on the form for metric-to-imperial calculations.
- Calculate efficiencies to three decimal places.
- The form is not interactive PDF-fillable in most viewers; many teams print or use digital overlays for clarity.
Why AF Form 1165 Matters for USAF Bases?
Proper monthly logging delivers real benefits:
- Efficiency Tracking — Identify trends in fuel use and combustion performance to reduce costs.
- Safety & Compliance — Supports mandatory inspections and environmental reporting under AFMAN 32-1068 and EPA rules.
- Maintenance Planning — Early detection of issues like excessive makeup water (indicating leaks) or efficiency drops.
- Audit Readiness — Provides clear, signed records for wing, MAJCOM, or external audits.
Facilities using high-temperature water systems for district heating, process loads, or mission-critical buildings depend on these logs to keep operations running smoothly.
Related Air Force Forms
- AF Form 1163 → Daily High Temperature Water Plant Operating Log (source data for AF Form 1165)
- AF Form 1458 → Daily Steam Boiler Plant Operating Log
- AF Form 1464 → Monthly Steam Boiler Plant Operating Log
- AF Form 1459 → Water Treatment Operating Log for Steam and Hot Water Boilers
All are available through the official Air Force e-Publishing portal.
Download AF Form 1165 PDF (Official & Free)
Get the latest official version directly from the U.S. Air Force e-Publishing site:
Download AF Form 1165 PDF Here
The file is a clean, printable two-page PDF. Always verify you are using the most current version by checking the Air Force e-Publishing website.
Frequently Asked Questions (FAQs)
Who is required to use AF Form 1165?
Boiler plant operators, supervisors, and civil engineering teams at USAF installations operating HTW plants >160 psig.
How often is the form completed?
Monthly, with daily data posted from AF Form 1163.
Is the form fillable online?
The official PDF supports basic filling in most PDF viewers, but many bases prefer printed versions for wet signatures.
Where do I find the governing instruction?
AFMAN 32-1068 (June 2020) is the primary reference.
How long must records be kept?
Minimum five years, with specific on-site and digital retention requirements.
Final Thoughts
AF Form 1165 remains a critical tool for professional, compliant, and efficient operation of high-temperature water plants across the U.S. Air Force. By maintaining accurate monthly logs, your team contributes directly to mission readiness, energy conservation, and regulatory adherence.
Bookmark this page and download your copy of the official AF Form 1165 PDF today. Need help with related forms or boiler plant procedures? Check the latest AFMAN 32-1068 on e-Publishing.af.mil for the most current guidance.
Last updated: April 2026 – All information sourced from official Department of the Air Force publications.