Dual Inertial
No failure report names the dual inertial. 5 FAA approvals let 2 companies make a replacement dual inertial, Litton Systems INC holding the most (4).
Approved replacement parts 5 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a dual inertial and sell it as an approved part for the models named. These are the companies holding such approvals for a dual inertial:
For these models most: Gulfstream G-1159 Gulfstream II and III (2), Boeing 707 (2).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Northrop Grumman Guidance and Electronics CO INC | Dual Inertial & one Inertial or one Omega/VLF Navigation... All parts noted on Top... | Modification Part | Gulfstream G1159, G1159A | 2008-02-21 | current |
| Litton Systems INC | Dual Inertial Navigation System - LTN-51 | Modification Part | Boeing 707-300, 707-400, 707-300B | 1996-08-29 | current |
| Litton Systems INC | Dual Inertial & one Inertial or one Omega/ VLF Navigation System LTN-72RL & one LTN 72 or... | Modification Part | Gulfstream G1159, G1159A | 1996-08-29 | current |
| Litton Systems INC | Dual Inertial Navigation System LTN- 51 or LTN-72 | Modification Part | Lockheed L382G | 1996-08-29 | current |
| Litton Systems INC | Dual Inertial Navigation System LTN-51, LTN-72 or one each... | Modification Part | Boeing 707-300, 707-400, 707-300B | 1996-08-29 | current |
Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.