Approved modifications · supplemental type certificate · current · reissued

SA660WE

Installation of HRD-type fire extinguishing system. (AND STC SA111WE). Held by Pacific Scientific, which holds 4 approved modifications in all. Last revised February 4, 1987. System: other and general.

What it applies to

Kind of product: Aircraft
Design holder: British Aerospace (Scotland); The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; de Havilland Inc. (Canada); Miscellaneous; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Twin Commander Aircraft Corporation; Twin Commander Aircraft Corporation; Twin Commander Aircraft Corporation
Models: HP 137 Jetstream Mk. 1, 310J, 310, 310B, 310C, 310D, 310F, 310G, 310H, 310A (USAF U-3A), 310P, 310R, T310Q, E310H, T310P, 310I, 310N, 310L, 310K, E310J, 310J-1, 310Q, 175B, 175C, 175A, 175, P172D, T210M, T210L, T210H, T210G, T210F, T210K, 340A, 320F, 320E, 320D, 340, M337B (USAF 02A), T337D, 337C, T337F, 337D, T337C, 337E, T337B, 337A (USAF 02B), 337, T337E, 337G, T337G, 401, 401A, 401B, 402, 402A, 402B, 414, 421, 421A, 421B, DHC-2 Series, Miscellaneous, PA-23, PA-23-160, PA-23-235, PA-23-250, PA-24, PA-24-250, PA-24-260, PA-24-400, PA-31P, P35, V35, N35, M35, 35-A33, J35, H35, 35-B33,...
Type certificates: A21EU, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A10, 3A17, 3A17, 3A17, 3A17, 3A17, 3A21, 3A21, 3A21, 3A21, 3A21, 3A21, 3A25, 3A25, 3A25, 3A25, 3A25, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A7CE, A7CE, A7CE, A7CE, A7CE, A7CE, A7CE, A7CE, A7CE, A7CE, A-806, Miscellaneous, 1A10, 1A10, 1A10, 1A10, 1A15, 1A15, 1A15, 1A15, A8EA, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A15, 3A16, 3A16, 3A16, 3A16, 3A16, 3A16, 3A16, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, 5A4, A-765, A-765, A-765, A-765, A-765, A-765, A-765, A-765, A-765, A-765, A-765, A-765, A-765, A-777, A-777, A-777, A-777, A-777, A-777, A-777, A-777, A-777, A12CE, 2A4, 2A4, 2A4
On this site: Beechcraft 35 Bonanza and Debonair 1,077 registered
Beechcraft 65 201 registered
Beechcraft 95 Travel Air and Baron 55 1,244 registered
Beechcraft E18 58 registered
Beechcraft TC-45 7 registered
Beechcraft UC-45 9 registered
Cessna 175 Skylark 925 registered
Cessna 310 1,410 registered
Cessna 320 137 registered
Cessna 337 Skymaster 370 registered
Cessna 340 707 registered
Cessna 401 51 registered
Cessna 402 174 registered
Cessna 414 Chancellor 605 registered
Cessna 421 Golden Eagle 769 registered
Cessna 680 Citation Sovereign and Latitude 697 registered
Cessna M337 34 registered
Cessna P172 23 registered
Cessna T-310 207 registered
Cessna T210 Turbo Centurion 1,283 registered
Cessna T337 193 registered
Piper PA-23 Apache and Aztec 1,316 registered
Piper PA-24 Comanche 2,428 registered
Piper PA-31 Navajo and Chieftain 935 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.