AH-1S High-Survivable Transmission System.
Abstract
The objective of the work performed on this program was to demonstrate that the AH-1S main transmission system modified with internal component improvements but without an emergency lubrication system could operate for 30 minutes following the loss of lubrication. The internal component improvements were based upon work done under a previous Eustis Directorate program conducted by Bell Helicopter Textron. Four different, modified versions of the AH-1S transmission configuration were tested under this program. All loss-of-lube testing was conducted at 950 input horsepower (84 percent of maximum continuous power rating of the AH-1S) and 6600 input rpm. The first transmission configuration tested ran 7 minutes under loss-of-lube conditions before failure of the main input spiral bevel pinion occurred. The second transmission configuration ran 21 minutes before the lower planetary stage failed. The third transmission configuration ran 19 minutes before a lower planetary stage failure occurred. The fourth transmission configuration ran 26.5 minutes before, again, a lower planetary stage failure occurred. It appears that a 30-minute loss-of-lube capability has been achieved for all transmission components except the lower planetary stage. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1977
- Accession Number
- ADA047558
Entities
People
- David J. Richardson
Organizations
- Bell Flight