Install LORI Oil Cooler, P/N L8535311.
FAA holder: Honeywell International Inc.
Aircraft STC directory
New Piper Aircraft PA-31-325 STCs
The Jun 30, 2026 FAA DRS snapshot contains 21 selected supplemental type certificates with status Current whose public applicability data names the New Piper Aircraft PA-31-325. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
21
listed Current at snapshot
14
holder directories
6
modification categories
Sep 22, 2021
latest recorded revision
Modification demand surface
Recorded holders
Recently revised PA-31-325 STCs
Showing the 21 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
Installation of King Model KCS 55A pictorial navigation (compass) system with optional KA 52 autopilot adapter.
FAA holder: Honeywell International Inc
Installation of King KFC-200, 2 axis (3 optional) flight control system, autopilot only or autopilot with flight director.
FAA holder: Honeywell International Inc
Installation of damage protection plates to the inboard, lower side of the flaps.
FAA holder: Hageland Aviation Services, Inc.
Installation of SMR technologies pneumatic de-icers.
FAA holder: SMR Technologies Inc
Installation of Shadin Co. fuel flow indicating system.
FAA holder: Shadin Company Inc
Installation of SMR Technologies pneumatic deicer models.
FAA holder: SMR Technologies Inc
Installation of side facing seats in accordance with (1) Custom Aircraft Conversions, Inc. Drawing List 7057, Revision B, dated 3/20/70, and E.O. No. 2, dated 11/6/71; or (2) Aviation Fabricators, Inc. STC Drawing List AF-206, Rev. (D), dated 5/5/98, or later FAA approved revision.
FAA holder: Aviation Fabricators Inc
Installation of single place composite commuter seats on the seat rail.
FAA holder: Aviation Fabricators Inc
Installation of left hand and right hand fuel cell assemblies.
FAA holder: A/C Fuel Cells Worldwide
Installation of single piece windshield.
FAA holder: LP Aero Plastics
Installation of various de-icer harnesses.
FAA holder: SMR Technologies
Installation of composite aft spinner bulkhead and/or composite spinner.
FAA holder: TCB Composite Co.
Piper conversion of air conditioning systems from using R12 to R134a refrigerant on aircraft models listed. For PA-31-300 s/n 31-660, 31-712 thru 31-900, 31-7300901& up. For PA-31-325 sns 31-7400990 & up. PA-31-350 sns, 31-5001& 31-5003, 31-7305005 up.
FAA holder: Steinbach & Associates, Inc.