ST04524AT
Installation of Ignition Mitigation Means (IMM) using Reticulated Polyurethane Foam (RPF) inside the auxiliary fuel tank system. Held by Jetaire Aerospace LLC, which holds 23 approved modifications in all. Last revised February 18, 2022. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company
- Models
- 727-100 Series, 727-100C Series, 727-200 Series, 727-200F Series, 727 Series, 727C Series
- Type certificates
- A3WE, A3WE, A3WE, A3WE, A3WE, A3WE
- On this site
- Boeing 727 37 registered
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 20, 2026.