# Honeywell Proposes F-35 PTMS Upgrade

Honeywell Aerospace has introduced the P40 upgrade for the Power and Thermal Management System (PTMS) on the Lockheed Martin F-35 fighter jet, enhancing cooling capacity by 25% to 40 kW. This upgrade supports integration of advanced weapons and sensors, including Northrop Grumman's AN/APG-85 radar, without requiring airframe modifications. The P40 presents a significant modernization opportunity for sustainment programs, particularly at locations like Eielson Air Force Base in Alaska where F-35 operations are active.

- **Why this matters:** Procurement professionals should note the P40 upgrade as a key enhancement to F-35 capabilities that can extend platform performance and sensor integration without costly airframe changes.
- The upgrade may influence upcoming sustainment contracts and modernization solicitations involving thermal management and avionics support.
- Contractors specializing in aerospace systems, thermal management, and sensor integration can evaluate partnership or bidding opportunities linked to this upgrade.
- Agencies operating F-35s, including at Eielson AFB, may consider this upgrade in future capability planning and budget allocations.

**Jurisdictions:** federal
**Industries:** Defense & Military
**Topics:** Physical Infrastructure
**Published:** September 22, 2026

### Vendors
- Honeywell Aerospace (prime contractor)
- Lockheed Martin (platform manufacturer)
- Northrop Grumman (sensor provider)

### Sources
- [Honeywell Proposes 'P40' Upgrade for F-35's PTMS - Defense Daily](https://www.defensedaily.com/honeywell-proposes-p40-upgrade-for-f-35s-ptms/air-force) - Defense Daily