| Alert Service Bulletins |
| ASB UH1-02-02 |
Tail rotor pulley bracket |
| ASB UH1-02-01 |
Tail rotor nut inspection |
| ASB UH1-97-01 |
Engine/Transmission driveshaft alignment |
| ASB UH1-96-04 |
Fin spar cap inspection |
| ASB UH1-94-02 |
Tail rotor PC cables |
| ASB UH1-94-01 |
2nd PT nozzle inspection |
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| Information Letters |
| IL UH1-03-02 |
Chadwick Helmuth tail rotor weight brackets |
| IL UH1-03-01 |
Application of AD 2003-01-04 |
| IL UH1-98-11 |
TB attachment fitting |
| IL UH1-98-10 |
42 & 90 degree gearbox overhaul |
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| Technical Bulletins |
| TB UH1-02-01 |
Lower main beam doublers |
| TB UH1-98-07 |
PAR installation |
| TB UH1-97-02 |
209/212 style transmission installation |
| TB UH1-95-01 |
212 main transmission support case |
| TB UH1-93-01 |
Interchangeable parts |
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| Service Letters |
| SL UH1-06-01 |
212 series 42 degree gearbox overhaul time interval increase |
| SL UH1-02-03 |
Rescission of SB's |
| UH1-97-SL-03 |
Stabilizer bar center frame |
| UH1-95-SL-02 |
212 mast bearing retirement |
| UH1-95-SL-01 |
Mast tube retirement |
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