Howell Instruments INC
Named as the FAA publishes it on its approvals.
Holds 8 approved modifications, most of them for the Hawker Siddeley HS.125 SERIES 700A. Approved to make 43 classes of equipment. FAA spelling: Howell Instruments Inc.
Approved modifications 8 · newest first
Hawker Siddeley HS.125 SERIES 700A 2Gulfstream G-1159 Gulfstream II and III 2Sikorsky Aircraft Corp S-76 1Dassault/Sud FAN JET FALCON 1Airbus Helicopters AS350 AStar (Écureuil), now H125 1
2012-09-12SR01163NY · Installation of Howell H2949-501 Engine Indicator/Monitor · AS-350B, AS-350B1, AS-350B2
2005-01-05SA4624SW · Replace existing N1, N2 and ITT indicators with Howell autotak and autotemp indicators. · BH.125 Series 400A, DH.125 Series 1A/S-522,...
2004-02-09SA4429SW · Installation of Howell autotak RPM indicator. · HS.125 Series 700A
1994-04-15SR00031NY · Installation of a Howell engine performance assurance monitoring system. · S-76B
1982-06-14SA4697SW · Installation of Howell autotemp and autotak indicators. · 690, 690A, 690B
1982-01-14SA4522SW · Installation of Howell TGT instruments. · G-1159
1982-01-08SA4576SW · Howell H922-8 oil pressure (digital) and oil temperature indicators. · G-1159A
1976-11-09SA2377SW · Install BH185R-289 EGT temperature indicator system. · Fan Jet Falcon
Equipment approvals technical standard order authorisations
2026-09-09TSO-C55a · FUEL AND OIL QUANTITY INSTRUMENTS · Data Acquisition Unit (DAU), Configuration Model Unit Plus (CMU), Display Unit · instruments and avionics
2026-01-20TSO-C113b · Airborne Multipurpose Electronic Displays · Display Unit, Display Unit · instruments and avionics
2026-01-20TSO-C43d · Temperature Instruments · Data Acquisition Unit (DCU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2026-01-20TSO-C47a · FUEL, OIL, AND HYDRAULIC PRESSURE INSTRUMENTS · Data Acquisition Unit (DCU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2026-01-20TSO-C49b · ELECTRIC TACHOMETER: MAGNETIC DRAG (INDICATOR AND GENERATOR) · Data Acquisition Unit (DCU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2026-01-20TSO-C55a · FUEL AND OIL QUANTITY INSTRUMENTS · Data Acquisition Unit (DCU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2025-11-21TSO-C113b · Airborne Multipurpose Electronic Displays · Display Unit · instruments and avionics
2025-11-21TSO-C43d · Temperature Instruments · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2025-11-21TSO-C47a · FUEL, OIL, AND HYDRAULIC PRESSURE INSTRUMENTS · Data Acquisition United (DAU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2025-11-21TSO-C49b · ELECTRIC TACHOMETER: MAGNETIC DRAG (INDICATOR AND GENERATOR) · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+), Dsiplay Unit · instruments and avionics
2025-09-09TSO-C113b · Airborne Multipurpose Electronic Displays · Display Unit, Display Unit · instruments and avionics
2025-09-09TSO-C49b · ELECTRIC TACHOMETER: MAGNETIC DRAG (INDICATOR AND GENERATOR) · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU), Display Unit · instruments and avionics
2025-09-09TSO-C47a · FUEL, OIL, AND HYDRAULIC PRESSURE INSTRUMENTS · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU), Display Unit · instruments and avionics
2025-09-09TSO-C45b · MANIFOLD PRESSURE INSTRUMENTS · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU), Display Unit · instruments and avionics
2025-09-09TSO-C44c · FUEL FLOWMETERS · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU), Display Unit · instruments and avionics
2025-09-09TSO-C43d · Temperature Instruments · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU), Display Unit · instruments and avionics
2025-05-15TSO-C43d · Temperature Instruments · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2025-05-14TSO-C113b · Airborne Multipurpose Electronic Displays · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2025-05-14TSO-C44c · FUEL FLOWMETERS · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2025-05-14TSO-C47a · FUEL, OIL, AND HYDRAULIC PRESSURE INSTRUMENTS · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2025-05-14TSO-C49b · ELECTRIC TACHOMETER: MAGNETIC DRAG (INDICATOR AND GENERATOR) · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2025-05-14TSO-C55a · FUEL AND OIL QUANTITY INSTRUMENTS · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+), Display Unit · instruments and avionics
2023-07-25TSO-C43d · Temperature Instruments · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+) · other and general
2023-07-25TSO-C44c · FUEL FLOWMETERS · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+) · other and general
2023-07-25TSO-C47a · FUEL, OIL, AND HYDRAULIC PRESSURE INSTRUMENTS · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+) · heating, ice protection and utility systems
2023-07-25TSO-C49b · ELECTRIC TACHOMETER: MAGNETIC DRAG (INDICATOR AND GENERATOR) · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+) · instruments and avionics
2023-07-25TSO-C55a · FUEL AND OIL QUANTITY INSTRUMENTS · Data Acquisition Unit (DAU), Configuration Module Unit Plus (CMU+) · other and general
2019-08-15TSO-C43c · TEMPERATURE INSTRUMENTS · AUTOTEMP INDICATOR, AUTOTEMP INDICATOR, AUTOTEMP INDICATOR · engine
2019-08-15TSO-C47a · FUEL, OIL, AND HYDRAULIC PRESSURE INSTRUMENTS · Data Acquisition Unit, Data Acquisition Unit, Turbine Inlet Temperature... · engine
2019-08-15TSO-C49b · ELECTRIC TACHOMETER: MAGNETIC DRAG (INDICATOR AND GENERATOR) · AUTOTACH INDICATOR, AUTOTAK N1 Indicator, Data Acquisition Unit · engine
2017-04-03TSO-C44c · FUEL FLOWMETERS · Data Acquisition Unit, Data Acquisition Unit · other and general
2017-04-03TSO-C55a · FUEL AND OIL QUANTITY INSTRUMENTS · Data Acquisition Unit, Data Acquisition Unit · other and general
2014-06-26TSO-C43c · TEMPERATURE INSTRUMENTS · AUTOTEMP® ITT Indicator, Oil Temp & Oil Pressure Indicator · instruments and avionics
2014-06-26TSO-C47a · FUEL, OIL, AND HYDRAULIC PRESSURE INSTRUMENTS · Oil Temp & Oil Pressure Indicator, Torque Indicator · instruments and avionics
2014-06-26TSO-C49b · ELECTRIC TACHOMETER: MAGNETIC DRAG (INDICATOR AND GENERATOR) · Fuel Flow Indicator, AUTOTAK® Gas Generator RPM (Ng) Indicator, AUTOTAK®... · propeller
2010-07-17TSO-C43 · Temperature Indicators · *, *, * · instruments and avionics
2010-07-17TSO-C43A · Temperature Instruments · *, *, * · instruments and avionics
2010-07-17TSO-C44A · Fuel Flowmeters · *, FUEL FLOW INDICATOR, AUTOTEMP INDICATOR · instruments and avionics
2010-07-17TSO-C47 · PRESSURE INSTRUMENTS - FUEL, OIL, AND HYDRAULIC · *, *, EPR INDICATOR/MONITOR · instruments and avionics
2010-07-17TSO-C49A · Electric Tachometer: Magnetic Drag (for Air Carrier Aircraft) · *, *, * · instruments and avionics
2010-07-10TSO-C43B · Temperature Instruments · *, AUTOTEMP INDICATOR · instruments and avionics
TSO-C49 · Electric Tachometer: Magnetic Drag (For Air Carrier Aircraft) · * · other and general
TSO-C9A · Automatic Pilots · * · other and general
Source: FAA Dynamic Regulatory System (type certificate data sheets, supplemental type certificates, parts manufacturer approvals, technical standard order authorisations). An organisation's name is as the FAA spelled it on each record; related spellings are separate pages.