The U.S. aircraft register, updated daily
Approved modifications · supplemental type certificate · current · amended

SH155WE

Installation of battery temperature monitor system. Held by K S Avionics, INC, which holds 6 approved modifications in all. Last revised June 22, 1978. System: electrical power.

What it applies to

Kind of product
Aircraft
Design holder
Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron (Canada); Bell Helicopter Textron (Canada); Bell Helicopter Textron (Canada); Bell Helicopter Textron (Canada); Eurocopter Deutschland GmbH; Eurocopter Deutschland GmbH; Eurocopter France; Eurocopter France; Eurocopter France; Eurocopter France; Eurocopter France; Eurocopter France; Eurocopter France; Eurocopter France; Eurocopter France; Eurocopter France; Hiller Aviation; Hiller Aviation; MD Helicopter Inc.; MD Helicopter Inc.; MD Helicopter Inc.; MD Helicopter Inc.; Rogerson Hiller Corporation; Rogerson Hiller Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation
Models
204B, 205A, 205A-1, 212, 206L, 206B, 206B-1, 206A, BO-105A, BO-105C, SA318B Alouette Astazou, SA3180 Alouette Astazou, SE313B Alouette II, SE3130 Alouette II, SA318C Alouette Astazou, SE.3160 Alouette III, SA.315B Alouette III, SA.316B Alouette III, SA.319B Alouette III, SA.316C Alouette III, UH-12L, FH-1100, 369HM, 369H, 369HS, 369HE, UH-12E-L, UH-12E, S-62A, S-61N, S-61L
Type certificates
H1SW, H1SW, H1SW, H4SW, H2SW, H2SW, H2SW, H2SW, H3EU, H3EU, 7H1, 7H1, 7H1, 7H1, 7H1, H1IN, H1IN, H1IN, H1IN, H1IN, H1WE, H2WE, H3WE, H3WE, H3WE, H3WE, 4H11, 4H11, 1H13, 1H15, 1H15
On this site
Aerospatiale SA315 22 registered
Bell 204 7 registered
Bell 205 58 registered
Bell 206 JetRanger and LongRanger 1,455 registered
Bell 212 59 registered
Fairchild Hiller FH-1100 8 registered
Hiller UH-12 217 registered
Hughes 369 500 series helicopters 123 registered
Md Helicopters Inc 369 108 registered
S N I A S SE 3130 7 registered
Sikorsky S-61 54 registered
Sud Aviation SA 318 5 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 21, 2026.