![](https://static.wixstatic.com/media/9f78cd_8e100b4085024d19ab15791abecb8d95.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/9f78cd_8e100b4085024d19ab15791abecb8d95.webp)
![42 Degree and 90 Degree Sight Glasses](https://static.wixstatic.com/media/9f78cd_8e100b4085024d19ab15791abecb8d95.jpg/v1/fill/w_316,h_237,fp_0.50_0.50,q_90,enc_auto/9f78cd_8e100b4085024d19ab15791abecb8d95.webp)
42 Degree and 90 Degree Sight Glasses
I have seen many 42 deg. and 90 deg. gearbox sight glasses that get stained and the oil very dark. Many times this shows up after a...
![](https://static.wixstatic.com/media/9f78cd_d3541100271d4b1aa52ee2ab4da8dfb5.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/9f78cd_d3541100271d4b1aa52ee2ab4da8dfb5.webp)
![Connecting Links Inspection](https://static.wixstatic.com/media/9f78cd_d3541100271d4b1aa52ee2ab4da8dfb5.jpg/v1/fill/w_316,h_237,fp_0.50_0.50,q_90,enc_auto/9f78cd_d3541100271d4b1aa52ee2ab4da8dfb5.webp)
Connecting Links Inspection
Back in late 1976 the military came out with TB 55-1500-219-20-6 to inspect the connecting links P/N’s 204-076-267-1 & 3 & 5 ( the parts...
![](https://static.wixstatic.com/media/9f78cd_e9348e58477b4dbd8e4b55e8478f8a70~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/9f78cd_e9348e58477b4dbd8e4b55e8478f8a70~mv2.webp)
![High Frequency Vibe in Pedals](https://static.wixstatic.com/media/9f78cd_e9348e58477b4dbd8e4b55e8478f8a70~mv2.jpg/v1/fill/w_316,h_237,fp_0.50_0.50,q_90,enc_auto/9f78cd_e9348e58477b4dbd8e4b55e8478f8a70~mv2.webp)
High Frequency Vibe in Pedals
Several years ago on another contract, we had a 212 that had come in after a day of flying with a logbook entry of “HIGH FREQ VIBRATION...
![](https://static.wixstatic.com/media/9f78cd_d2da17df25e34dd48c821012eef45363.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/9f78cd_d2da17df25e34dd48c821012eef45363.webp)
![Swashplate Trunnion Bolts](https://static.wixstatic.com/media/9f78cd_d2da17df25e34dd48c821012eef45363.jpg/v1/fill/w_316,h_237,fp_0.50_0.50,q_90,enc_auto/9f78cd_d2da17df25e34dd48c821012eef45363.webp)
Swashplate Trunnion Bolts
When installing trunnion’s in any of the five positions on the swashplate be sure to install the inner retaining bolt first. The one on...
![Tail Rotor Lube](https://static.wixstatic.com/media/9f78cd_ef80d4690e3149e0b3a358ebcb789eb7~mv2.png/v1/fill/w_316,h_237,fp_0.50_0.50,q_95,enc_auto/9f78cd_ef80d4690e3149e0b3a358ebcb789eb7~mv2.webp)
Tail Rotor Lube
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![UH-1 Main Rotor System Question](https://static.wixstatic.com/media/9f78cd_3af992788dc347e4843d1beac2823849~mv2.png/v1/fill/w_316,h_237,fp_0.50_0.50,q_95,enc_auto/9f78cd_3af992788dc347e4843d1beac2823849~mv2.webp)
UH-1 Main Rotor System Question
Alright for those with eagle eyes, what is wrong with this Main Rotor System?