A Lost VA Jet Engine Medical History?

The VA didn’t know? 
 
by Jake Green

From 1956 is the Project 7210 known certain jet engine injury for ALL UNPROTECTED flight line and navy deck personnel. It is requested that you ask your congressional representatives to make sure that oversight and accountability is realized for all. This is for a 1948 required but ignored 95 decibels (dB) noise level, without protection injury. It is a sound pressure multiple (X) of 59 times that of a normal conservation. Accordingly, a then 1956 Project 7210 known certain disability from an unprotected sound pressure of 6,144 X (@ 135 dB) to 815,583 X (@ 177 dB) exposure.
 
A mysterious disappearance of proof!

     A 2009 visit to the Project 7210 "contrails.iit.edu" site revealed that the under its "search", using "TR 54-401", the 130 page jet engine noise levels Report has disappeared! This is the proof of the U. S. Military’s unprotected jet engine very high noise levels that ranged from 135 dB to 177 dB. It was a then known certain injury in direct disobedience of the 1948 Air Force Regulation (AFR) 160-3. A follow on to the Harvard Univ. WWII V-51R hearing protection. This is the AFR 160-3 required protection at a 95 dB. maximum noise level with a sound pressure multiple (X) of 59. The USAF Wright Air Development Center "contrails.iit.edu" site had the July 1956, Project 7210, Technical Report (TR) 54-401. Recorded, at a radius of 50 feet, are the noise levels for 27 versions of 10 jet-engines in 1947 to 1956 U. S. Military service. This previously received, now vanished from site report is available on request. The sound pressure multiple (X) source is the American Medical Association (AMA) Family Medical Guide 3d. Edition page 365, also email available. Its 60 dB "Normal conversation" is the base line for the calculated AMA "….sound pressure doubles with an increase of 6 decibels". Accordingly, the 27 versions of the10 jet-engines have overall sound pressure multiples ranging from a low of 6,144 X (@ 135 dB) to a high of 815,583 X (@ 177 dB) vs. the ignored required 59 X (@ 95 dB) protection.
 
TR 54-401 and this veteran’s in-hand documentation could help some so exposed, e.g., "Had some trouble with hearing while working on warm-up crew for F-86 D with very high noise levels." The physician’s 29 Jan. 54 USAF Cadet Wing Commander washout statement. At Tyndall AFB, Panama City, Florida the hundreds of flight line personnel were unprotected and subjected to the Project 7210 "very high noise levels". For F-86D personnel it is the then known certain J47-GE-1 jet-engine noise level injury, i.e., the TR 54-401 pages 68-75, "Test Group 10, Date of the Tests: 1952, Test Numbers 62-64". This is an at 50 feet 158 dB noise level with an 87,381 X sound pressure multiple. Fifteen (15) of the 77 were repeatedly exposed to a "warm-up crew" level of over 699,051 X at 176 dB! As with ALL UNPROTECTED flight line (USAF, Army & USN) and flight deck (USN) personnel, they worked much closer to the jet-engines than the at 50 feet recorded noise levels. Therefore, all were subjected to well over the 6,144 X to 815,583 X sound pressure multiples. An over 50 years of VA lessons learned from an unprotected injury in direct disobedience of the 1948 AFR 160-3 requirement..