Proportional Hour
No failure report names the proportional hour. 8 FAA approvals let 3 companies make a replacement proportional hour, Spirent Systems Wichita INC holding the most (4).
Approved replacement parts 8 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a proportional hour and sell it as an approved part for the models named. These are the companies holding such approvals for a proportional hour:
For these models most: Cessna T210 Turbo Centurion (3), Cessna P210 Pressurized Centurion (3), Cessna 210 Centurion (3), Beechcraft A36 Bonanza (3), Beechcraft 35 Bonanza and Debonair (3), Beechcraft B36 Bonanza (2), Beechcraft V35 Bonanza (1), Beechcraft H35 (1), Beechcraft G33 (1), Beechcraft F33 Bonanza (1), Beechcraft E33 (1), Beechcraft A35 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Teledyne Controls LLC | Proportional Hour Counter 0540-008 | 0540-008 | Cessna 210, 210A thru 210R, T210F thru T210R | 2016-01-03 | current |
| Teledyne Controls LLC | Proportional Hour Counter 0540-008 | 0540-008 | Beech Models 35, A35 thru G35, 35R) (35-33 | 2016-01-03 | current |
| Spirent Systems Wichita INC | Proportional Hour Counter 0540-008 | Modification Part | Raytheon 35-33, 35-A33, 35-B33 | 2000-10-26 | current |
| Spirent Systems Wichita INC | Proportional Hour Counter 0540-008 | Modification Part | Cessna 210, 210A thru 210R, T210F thru 210R | 2000-10-26 | current |
| Spirent Systems Wichita INC | Proportional Hour Counter 0541-003 | Partenavia NOR 7-1041-2 | Partenavia AP68TP-600 Viator | 2000-10-26 | current |
| Spirent Systems Wichita INC | Proportional Hour Counter 0540-008 | Modification Part | Raytheon 35, A35 thru G35, 35R | 2000-10-26 | current |
| B & D Instruments & Avionics INC | Proportional Hour Counter 0541-003 | Partenavia NOR7.1041-2 | Partenavia AP68TP-600 Viator | 1995-10-30 | current |
| B & D Instruments & Avionics INC | Proportional Hour Counter 0540-008 | Modification Part | Beech Raytheon) (35-33, 35-A33, 35-B33 | 1995-08-17 | 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.