# N304FD: 2017 Agustawestland Philadelphia AW139

- Status: Valid registration
- Airframe: [Agustawestland Philadelphia AW139](https://openairdocs.org/model/agustawestland-philadelphia-aw139) (registry code 0260400, 17 seats)
- Engine: [Pratt & Whitney Canada PT6C-67C](https://openairdocs.org/engine/pratt-whitney-canada-pt6c-67c) (registry code 52174)
- Data sheets: [TCDS R00002RD](https://openairdocs.org/tcds/R00002RD) (Leonardo S.p.a.), [TCDS E00068EN](https://openairdocs.org/tcds/E00068EN) (Pratt & Whitney Canada Corp.) (OpenAirDocs)
- Serial number: 41528
- Year built: 2017
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Airworthiness: Standard, transport
- Airworthiness date: April 18, 2017
- Certificate issued: July 14, 2017
- Expires: July 31, 2027
- Mode S code: A32EAF
- Registered owners: [City Of Los Angeles](https://openairdocs.org/faa-owner/CITY%20OF%20LOS%20ANGELES), [Air Operations](https://openairdocs.org/faa-owner/AIR%20OPERATIONS)
- Location: [Van Nuys, CA](https://openairdocs.org/faa-place/CA/Van%20Nuys)
- Owner type: Government
- Owner's area on the map: 34.1975° N, 118.4890° W: Placed by OpenAirDocs at the center of ZIP code 91406, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=304FD
- Page: https://openairdocs.org/aircraft/N304FD

From the FAA registry file of October 22, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination.

## ADs that may apply (OpenAirDocs): 66 in force

### Matched by airframe (Agustawestland Philadelphia AW139)

- [AD 2026-20-07](https://openairdocs.org/ad/2026-20-07): Engine exhaust system · Leonardo AB139 and AW139. Effective Oct 16, 2026
- [AD 2026-17-05](https://openairdocs.org/ad/2026-17-05): Cabin Equipment/Furnishings · Airbus Helicopters H160-B, EC225LP, AS 365 N3 and 18 more. Effective Oct 2, 2026
- [AD 2026-10-03](https://openairdocs.org/ad/2026-10-03): Tail rotor control system · Leonardo AB139, AW139 and AW189. Effective Jun 25, 2026
- [AD 2026-09-05](https://openairdocs.org/ad/2026-09-05): Life Raft · Leonardo AW139 and AB139. Effective Jun 17, 2026
- [AD 2026-04-03](https://openairdocs.org/ad/2026-04-03): Electrical Power System Wiring · Leonardo AB139 and AW139. Effective Apr 2, 2026
- [AD 2026-06-01](https://openairdocs.org/ad/2026-06-01): Placards and Markings · Leonardo AB139 and AW139 with STC SR00049IB. Effective Mar 31, 2026
- [AD 2025-07-01](https://openairdocs.org/ad/2025-07-01): Air Data Computer · Synthetic Vision Electronic Flight Information System (Arrow STC SR09595RC or ST01523WI). Effective May 15, 2025
- [AD 2025-03-03](https://openairdocs.org/ad/2025-03-03): Cabin Equipment/Furnishings · Leonardo A109E, A109K2, A109S and 4 more. Effective Feb 19, 2025
- [AD 2024-26-08](https://openairdocs.org/ad/2024-26-08): Main Landing Gear · Leonardo AW139 and AB139. Effective Jan 17, 2025
- [AD 2024-17-07](https://openairdocs.org/ad/2024-17-07): Tail Rotor System · Leonardo AB139 and AW139. Effective Nov 12, 2024
- [AD 2023-11-07](https://openairdocs.org/ad/2023-11-07): Ground Proximity System · Airbus Helicopters 47, 206, 210 and 237 more. Effective Jun 22, 2023
- [AD 2023-10-05](https://openairdocs.org/ad/2023-10-05): Main Rotor System · Leonardo AB139 and AW139. Effective Jun 7, 2023
- [AD 2023-03-03](https://openairdocs.org/ad/2023-03-03): Tail Rotor System · Leonardo AB139 and AW139. Effective Mar 23, 2023
- [AD 2022-27-03](https://openairdocs.org/ad/2022-27-03): Main Rotor Gearbox · Leonardo AB139 and AW139. Effective Jan 31, 2023
- [AD 2022-22-03](https://openairdocs.org/ad/2022-22-03): Electrical Power System Wiring · Leonardo AB139 and AW139. Effective Nov 17, 2022
- [AD 2022-11-20](https://openairdocs.org/ad/2022-11-20): Fuselage Structure · Leonardo AB139 and AW139. Effective Jul 27, 2022
- [AD 2022-07-01](https://openairdocs.org/ad/2022-07-01): Emergency Equipment, Life Raft · Leonardo AB139 and AW139. Effective May 9, 2022
- [AD 2022-05-10](https://openairdocs.org/ad/2022-05-10): Cabin Equipment/Furnishings · Airbus Helicopters AS332L, AS332L1, AS332L2 and 57 more. Effective Apr 20, 2022
- [AD 2022-02-12](https://openairdocs.org/ad/2022-02-12): Aircraft Structures, Main Rotor Drive Systems · Leonardo AB139 and AW139. Effective Mar 17, 2022
- [AD 2022-01-03](https://openairdocs.org/ad/2022-01-03): Fire Bottle, Portable · Airbus Helicopters AS332C, AS332C1, AS332L and 35 more. Effective Mar 7, 2022
- [AD 2021-23-22](https://openairdocs.org/ad/2021-23-22): Main Rotor System · Leonardo AB139 and AW139. Effective Jan 18, 2022
- [AD 2021-22-02](https://openairdocs.org/ad/2021-22-02): Electrical Power System · Leonardo AB139 and AW139. Effective Jan 3, 2022
- [AD 2021-21-08](https://openairdocs.org/ad/2021-21-08): Ice/Rain Protection System Wiring, Tail Rotor Blades · Leonardo AB139 and AW139. Effective Dec 10, 2021
- [AD 2021-20-12](https://openairdocs.org/ad/2021-20-12): Emergency Flotation Section · Leonardo AB139, AB412, AB412 EP and 1 more. Effective Nov 22, 2021
- [AD 2021-20-10](https://openairdocs.org/ad/2021-20-10): Main Rotor Gearbox · Leonardo AB139 and AW139. Effective Nov 22, 2021
- [AD 2021-22-07](https://openairdocs.org/ad/2021-22-07): Fire Bottle, Portable · Airbus A319-111, A319-112, A319-113 and 127 more. Effective Nov 18, 2021
- [AD 2021-22-13](https://openairdocs.org/ad/2021-22-13): Cargo Compartments · Leonardo AB139 and AW139. Effective Nov 17, 2021
- [AD 2021-19-03](https://openairdocs.org/ad/2021-19-03): Auto Flight System · Leonardo AB139 and AW139. Effective Nov 1, 2021
- [AD 2021-18-11](https://openairdocs.org/ad/2021-18-11): Tail Rotor System · Leonardo AB139 and AW139. Effective Nov 1, 2021
- [AD 2021-17-15](https://openairdocs.org/ad/2021-17-15): Main Rotor Blades · Leonardo AB139 and AW139. Effective Oct 13, 2021
- [AD 2021-15-09](https://openairdocs.org/ad/2021-15-09): Emergency Flotation Section · Leonardo AB139 and AW139. Effective Aug 27, 2021
- [AD 2021-14-18](https://openairdocs.org/ad/2021-14-18): Tail Rotor Blades · Leonardo AB139 and AW139. Effective Aug 24, 2021
- [AD 2021-13-01](https://openairdocs.org/ad/2021-13-01): Main Rotor System · Leonardo AB139, AW139 and AW189. Effective Aug 3, 2021
- [AD 2021-13-21](https://openairdocs.org/ad/2021-13-21): Main Rotor Mast/Swashplate · Leonardo AB139, AW139 and AW189. Effective Jul 12, 2021
- [AD 2021-12-10](https://openairdocs.org/ad/2021-12-10): Placards and Markings · Leonardo AB139 and AW139. Effective Jun 22, 2021
- [AD 2021-05-21](https://openairdocs.org/ad/2021-05-21): Main Rotor System · Leonardo AB139 and AW139. Effective May 7, 2021
- [AD 2021-03-07](https://openairdocs.org/ad/2021-03-07): Engine Mount Section · Leonardo AB139 and AW139. Effective Apr 1, 2021
- [AD 2021-04-01](https://openairdocs.org/ad/2021-04-01): Cabin Equipment/Furnishings · Leonardo AB139 and AW139. Effective Mar 26, 2021
- [AD 2020-19-04](https://openairdocs.org/ad/2020-19-04): Rotor Drive-Gearbox · Leonardo AB139 and AW139. Effective Oct 15, 2020
- [AD 2020-15-18](https://openairdocs.org/ad/2020-15-18): Emergency Flotation Section · Leonardo AB139, AW139, AW169 and 1 more. Effective Sep 3, 2020
- [AD 2019-12-15](https://openairdocs.org/ad/2019-12-15): Landing Gear System · Leonardo AB139 and AW139. Effective Aug 2, 2019
- [AD 2019-12-06](https://openairdocs.org/ad/2019-12-06): Tail Rotor Driveshaft · Leonardo AW139. Effective Jul 30, 2019
- [AD 2019-05-03](https://openairdocs.org/ad/2019-05-03): Tail Rotor System · Leonardo AB139, AW139, AW169 and 1 more. Effective Mar 28, 2019
- [AD 2018-04-11](https://openairdocs.org/ad/2018-04-11): Tail Rotor Control System · Agusta AB139 and AW139. Effective Apr 5, 2018
- [AD 2018-03-01](https://openairdocs.org/ad/2018-03-01): Main Rotor Blades · Agusta AB139 and AW139. Effective Feb 14, 2018
- [AD 2016-26-01](https://openairdocs.org/ad/2016-26-01): Hydraulic Power · Agusta AB139 and AW139. Effective Jan 31, 2017
- [AD 2016-01-15](https://openairdocs.org/ad/2016-01-15): Fuselage Structure (General) · Agusta AB139 and AW139. Effective Feb 25, 2016
- [AD 2016-01-06](https://openairdocs.org/ad/2016-01-06): Propeller/Rotor Anti-ice/De-Ice System · Agusta AB139 and AW139. Effective Jan 28, 2016
- [AD 2015-02-21](https://openairdocs.org/ad/2015-02-21): Hydraulic System, Main · Agusta AB139 and AW139. Effective Mar 17, 2015
- [AD 2008-14-02 R1](https://openairdocs.org/ad/2008-14-02-R1): Fuselage, Main Frame · Agusta AB139 and AW139. Effective Jan 16, 2015

### Matched by engine (Pratt & Whitney Canada PT6C-67C)

- [AD 2013-03-14](https://openairdocs.org/ad/2013-03-14): Power turbine (PT) baffle · Pratt & Whitney Canada PT6C-67C. Effective Mar 26, 2013

### Historical (superseded or no longer in force)

- [AD 2023-07-51](https://openairdocs.org/ad/2023-07-51) (historical): Main Rotor System · Leonardo AB139 and AW139
- [AD 2021-23-13](https://openairdocs.org/ad/2021-23-13) (historical): Ground Proximity System · Airbus Helicopters K-225, K-190A, K-240 and 237 more. Effective Dec 9, 2021
- [AD 2020-23-07](https://openairdocs.org/ad/2020-23-07) (historical): Emergency Equipment, Life Raft · Leonardo AB139 and AW139. Effective Dec 4, 2020
- [AD 2017-23-08](https://openairdocs.org/ad/2017-23-08) (historical): M/R System · Agusta AB139 and AW139. Effective Dec 11, 2017
- [AD 2014-24-02](https://openairdocs.org/ad/2014-24-02) (historical): M/R System · Agusta AB139 and AW139. Effective Dec 15, 2014
- [AD 2014-07-51](https://openairdocs.org/ad/2014-07-51) (historical): M/R System · Agusta AB139 and AW139. Effective Aug 20, 2014
- [AD 2012-26-15](https://openairdocs.org/ad/2012-26-15) (historical): Navigation · Agusta AW139, A318-111, A318-112 and 71 more. Effective Jan 24, 2013
- [AD 2011-18-52](https://openairdocs.org/ad/2011-18-52) (historical): Tail Rotor Blade · Agusta AB139 and AW139. Effective May 3, 2012
- [AD 2009-19-51](https://openairdocs.org/ad/2009-19-51) (historical): Tailboom · Agusta AB139 and AW139. Effective Feb 8, 2010
- [AD 2008-14-02](https://openairdocs.org/ad/2008-14-02) (historical): Fuselage frame · Agusta AB139 and AW139. Effective Aug 14, 2008

All 76: https://openairdocs.org/aircraft/N304FD/ads.md

## Information bulletins (advisory) (1 in force)

- [SAIB NM-10-12](https://openairdocs.org/saib/NM-10-12): Navigation: Flight Management System. Issued Jan 7, 2010

## NTSB investigations (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ANC17LA051](https://openairdocs.org/ntsb/ANC17LA051), Sep 2, 2017: Leonardo AW139 (N304FD), Tujunga, CA, substantial damage. Probable cause: A yaw excursion and uncontrolled descent due to loss of tail rotor effectiveness during aerial firefighting operations resulting in an impact with trees. A contributing factor was the pilot’s failure…

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20170902015879A](https://openairdocs.org/incident/20170902015879A), Sep 2, 2017: Agusta AW-139 (N304FD), Tujunga, CA, Substantial damage. While fire fighting (dropping water), N304FD(la city fire) descended into trees causing damage to the underside and rear of helicopter. The helicopter managed…

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## Service difficulty reports on N304FD not matched to an aircraft (3)

They name N304FD, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [SDR ULXR2009021080902](https://openairdocs.org/sdr/ULXR2009021080902), Feb 10, 2009: THROTTLE CONTROL. WORN. THIS TUBE WAS WORN AROUND THE CIRCUMFERENCE AT THE POINT WHERE IT PASSES THROUGH THE FIREWALL BOOT. DISCOVERED DURING A 300 HOUR INSPECTION AND REPLACED.
- [SDR ULXR2009021080903](https://openairdocs.org/sdr/ULXR2009021080903), Feb 10, 2009: TUBE. WORN. THIS TUBE WAS WORN AROUND THE CIRCUMFERENCE AT THE POINT WHERE IT PASSES THROUGH THE FIREWALL BOOT. DISCOVERED DURING A 300 HOUR INSP AND REPLACED.
- [SDR 2005FA0000413](https://openairdocs.org/sdr/2005FA0000413), Jan 11, 2005: BLADE. VIBRATION. ON FIRST GROUND RUN, AFTER APPROX 24 HOURS OF HARD RAIN, THE HELICOPTER DEVELOPED A SEVERE VIBRATION. THE VIBRATION WAS TRACED TO A TAIL ROTOR BLADE. SUSPECT BL

## STCs that may be installed (OpenAirDocs) (77, first 50)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the airframe (Agustawestland Philadelphia AW139)

- [STC SR04481AT](https://openairdocs.org/stc/SR04481AT): Installation of LED steerable searchlight/landing light assembly in replacement to the legacy steerable searchlight/landing light assembly. Sterling Helicopter
- [STC SR12212IB](https://openairdocs.org/stc/SR12212IB): Installation of Mission Cabin Equipment. ICARUS Aero Inc
- [STC SR03024NY](https://openairdocs.org/stc/SR03024NY): Installation of Aerolite GmbH Emergency Medical System (EMS) Equipment P/N 139250-501. Aerolite AG
- [STC SR04585NY](https://openairdocs.org/stc/SR04585NY): Replacement of Vertical and Horizontal Stabilizer Lights with LED Position/Anti-collision Lights. Whelen Aerospace Technologies
- [STC SR11945MC](https://openairdocs.org/stc/SR11945MC): Modify AW139 to expand the flight envelope for 7040 kg maximum gross weight and enable CAT II ILS capability, including cockpit software upgrade. The Boeing Company
- [STC SR00228IB](https://openairdocs.org/stc/SR00228IB): Installation of Actuator Assembly Replacement Kit P/N 318783a for Floats Inflation System. AERO SEKUR S.P.A
- [STC SR04731NY](https://openairdocs.org/stc/SR04731NY): Installation of NNSA Detector and Workstation Interior Layout Provisions. Mecaer Aviation Group
- [STC SR02473AK](https://openairdocs.org/stc/SR02473AK): Installation of the L-3 Communications NGT-9000R/RD and NGT-9000/D ADS-B IN/OUT system. StandardAero Atlantic USA Inc
- [STC SR04729NY](https://openairdocs.org/stc/SR04729NY): Installation of a Davtron Digital Cabin Air Temperature System. Mecaer Aviation Group
- [STC SR00179IB](https://openairdocs.org/stc/SR00179IB): Installation of SKYTRAC SDL-350 Flight Following/SATCOM System. SKYTRAC Systems Ltd
- [STC SR00162IB](https://openairdocs.org/stc/SR00162IB): Installation of SKYTRAC SDL-350 Flight Following/SATCOM System (Provisions Only). SKYTRAC Systems Ltd
- [STC SR00186MC](https://openairdocs.org/stc/SR00186MC): Installation of : Crash-Resistant, Ballistically Tolerant Fuel Tanks, New Pilot Seats, New Cabin Seats (Mulitiple Configurations) and Weight Saving Modification. The Boeing Company
- [STC SR00222MC](https://openairdocs.org/stc/SR00222MC): Installation of a LifePort Isolated Personnel Stacking Litter (IPSL) and Aft Facing Troop Seat. Life Port LLC
- [STC SR00207MC](https://openairdocs.org/stc/SR00207MC): Integrate avionics equipment into the AW139 cockpit software and modify mission equipment. The Boeing Company
- [STC SH3319NM](https://openairdocs.org/stc/SH3319NM): Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,. Precise Flight Inc
- [STC SR00384BO](https://openairdocs.org/stc/SR00384BO): Installation of a Satcom and Flight Data Monitoring System KIT 139-SAT-100. Outerlink Corporation
- [STC SR04785NY](https://openairdocs.org/stc/SR04785NY): Installation of Outerlink Corporation Air IP system. Sterling Helicopter
- [STC SR00049IB](https://openairdocs.org/stc/SR00049IB): Installation of VIP 87 Interiors P/N 6AB1AD008-001. Mecaer Aviation Group S.p.A
- [STC SR04718NY](https://openairdocs.org/stc/SR04718NY): Installation of RDR-7000 Weather Radar. Scandinavian Avionics Design ApS
- [STC SR04472CH](https://openairdocs.org/stc/SR04472CH): Installation of a Honeywell RDR-7000 Weather Radar System. Honeywell International Inc
- [STC SR01949LA](https://openairdocs.org/stc/SR01949LA): Installation of Apical Industries, Inc. Liferaft Kit. Dart Aerospace ULC
- [STC SR04207NY](https://openairdocs.org/stc/SR04207NY): Installation of Rosen R2181000 Sunvisor Assembly. Mecaer Aviation Group Inc
- [STC SR00184MC](https://openairdocs.org/stc/SR00184MC): Expands the operating envelope without an increase to the currently certified maximum gross weight. The Boeing Company
- [STC SR04589NY](https://openairdocs.org/stc/SR04589NY): Installation of Recognition Lights, Configurations #1 thru #4. Aviation Completion Innovations Inc
- [STC SR03007NY](https://openairdocs.org/stc/SR03007NY): Installation of two Class 2 Electronic Flight Bag (EFB) mounting device arm-mounted. Aviation Completion Innovations Inc
- [STC SR01064DE](https://openairdocs.org/stc/SR01064DE): Installation of Axnes PNG wireless intercom extension system. Axnes Inc
- [STC SR02330AK](https://openairdocs.org/stc/SR02330AK): Installation of the Max-Viz® Enhanced Vision System (EVS) Models 1000/1500 and associated hardware. PECO Inc
- [STC SR09911AC](https://openairdocs.org/stc/SR09911AC): Installation of alternate hoist cable. Breeze Eastern LLC
- [STC SR03250NY](https://openairdocs.org/stc/SR03250NY): Installation of the dedicated EMS Equipment, P/N 139-0004728-501. Aerolite AG
- [STC SR09628RC](https://openairdocs.org/stc/SR09628RC): Installation of Sky Connect Phone and Tracker System. Honeywell International Inc
- [STC SR00925DE](https://openairdocs.org/stc/SR00925DE): Installation of Garmin GTX 335/335R and GTX345/345R transponders to provide ADS-B Out and In functionality. Peregrine
- [STC SR02614NY-D](https://openairdocs.org/stc/SR02614NY-D): Installation of the Medical Litter System. LifePort LLC
- [STC SR04384NY](https://openairdocs.org/stc/SR04384NY): Installation of P/N 139084-501 for 3 stretcher kit with relevant cabin floor rails and featuring each, dedicated oxygen and electrical distribution systems and oxygen bottles stowage provisions. Aerolite Max Bucher AG
- [STC SR04383NY](https://openairdocs.org/stc/SR04383NY): Installation of a Technisonic TDFM-9100 Multiband P25 Airborne Transceiver System. Shock Trauma Air Rescue Service
- [STC SR02054LA](https://openairdocs.org/stc/SR02054LA): Installation of an Emergency Medical System. LifePort LLC
- [STC SR02136LA](https://openairdocs.org/stc/SR02136LA): Installation of a Supplement Oxygen System. LifePort LLC
- [STC SR02145LA](https://openairdocs.org/stc/SR02145LA): Installation of a Medical Litter System. LifePort LLC
- [STC SR03060NY](https://openairdocs.org/stc/SR03060NY): Installation of Engine Wash Kit. Aviation Completion Innovations Inc
- [STC SR04310NY](https://openairdocs.org/stc/SR04310NY): Installation of the Cabin Door Fixed Handle. Icarus Aero Inc
- [STC SR03265CH](https://openairdocs.org/stc/SR03265CH): Install air ambulance conversion. Spectrum Aeromed LLC dba Spectrum Aeromed
- [STC SR02325NY](https://openairdocs.org/stc/SR02325NY): Installation of Cabin Interior Sound Reduction Wall Panels System. Aviation Completion Innovations Inc
- [STC SR02326NY](https://openairdocs.org/stc/SR02326NY): Installation of Cabin Door Step System. Aviation Completion Innovations Inc
- [STC SR02751NY](https://openairdocs.org/stc/SR02751NY): Installation of a Max-Viz, Inc. Enhanced Vision System (EVS) Model 1500. Aviation Completion Innovations Inc
- [STC SR02753NY](https://openairdocs.org/stc/SR02753NY): Installation of a Sagem Avionics, Inc; ICDS-10 Multi Functions Display. Aviation Completion Innovations Inc
- [STC SR03476NY](https://openairdocs.org/stc/SR03476NY): The installation of electrically operated cabin window shades. Aviation Completion Innovations Inc
- [STC SR04264NY](https://openairdocs.org/stc/SR04264NY): Installation of Garmin GDL84H ADS-B System. Maxcraft Avionics Ltd
- [STC SR02138SE](https://openairdocs.org/stc/SR02138SE): Installation of Dart D139-799 Maintenance Kits. Dart Aerospace USA Inc
- [STC SR00826DE](https://openairdocs.org/stc/SR00826DE): Installation of Honeywell Sky Connect Tracker III system. Cert Works LLC
- [STC SR02104SE](https://openairdocs.org/stc/SR02104SE): Installation of a Supplemental Lighting System; manufactured and installed in accordance with Aviation Specialties Unlimited (ASU) Master Drawing List MDL-139004-3, Rev. A, dated February 1, 2011, or later FAA-approved revisions and maintained in a accordance with ASU Instructions for Continued Airworthiness ICA-139004-4, Rev IR, dated July 7, 2010, or later FAA-accepted revisions. Aviation Specialties Unlimited Inc
- [STC SR02772CH](https://openairdocs.org/stc/SR02772CH): Installation of an Inlet Barrier Filter (IBF) System in accordance with Aerospace Filtration Systems, Inc. Installation-IBF System Drawing No. 122000-010, Revision B, dated September 28, 2009, or later FAA Approved revision. Donaldson Company Inc

All 77: https://openairdocs.org/aircraft/N304FD/stcs.md

## Related

- Other Agustawestland Philadelphia AW139 aircraft: https://openairdocs.org/model/agustawestland-philadelphia-aw139/aircraft.md
- The Pratt & Whitney Canada PT6C-67C engine: https://openairdocs.org/engine/pratt-whitney-canada-pt6c-67c.md

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