Installation of King Model KCS 55A pictorial navigation (compass) system with optional KA 52 autopilot adapter.
FAA holder: Honeywell International Inc
Aircraft STC directory
New Piper Aircraft PA-31-350 STCs
The Jun 30, 2026 FAA DRS snapshot contains 24 selected supplemental type certificates with status Current whose public applicability data names the New Piper Aircraft PA-31-350. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
24
listed Current at snapshot
16
holder directories
9
modification categories
Mar 31, 2020
latest recorded revision
Modification demand surface
Recorded holders
Honeywell International Inc2Paul/ Lanna Egan LLC2Aviation Fabricators Inc2Hageland Aviation Services, Inc1SMR Technologies Inc1M-20 Oil Separators LLC1Shadin Company Inc1Avidyne Corporation1JAARS Inc.1Black Cat Aviation Inc.1Fargo Jet Center1LP Aero Plastics1SMR Technologies1TCB Composite Co.1Rockwell Collins Inc1Steinbach & Associates, Inc.1
Recently revised PA-31-350 STCs
Showing the 24 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 KFC-200, 2 axis (3 optional) flight control system, autopilot only or autopilot with flight director.
FAA holder: Honeywell International Inc
Installation of SAFT type 2376 nickel-cadmium battery.
FAA holder: Frontier Flying Service Inc.
Installation of Hartzell HC-E3YR-2ATF/FC8468( )-8Q (left engine) and HC-E3YR-2ALTF/FJC8468( )-8Q (right engine) propeller assemblies. PA-31-350 (T-1020) and PA-31-350 (Chieftain). Serial numbers 31-7405218, 238, 485, 490; 31-7552043, 076; and 31-7652144 are ineligible for this installation.
FAA holder: Frontier Flying Service 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 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 a secondary flap interconnected landing gear warning system (Kit No. WAV-LGWS-001).
FAA holder: Warbelow's Air Ventures, Inc.
Installation of single piece windshield.
FAA holder: LP Aero Plastics
Installation of SLFMR Microwave Radiometer Pod.
FAA holder: Rick Aviation
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.
AP106 2-axis or 3-axis autopilot including yaw damper and FD-108 flight director.
FAA holder: Rockwell Collins Inc
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.