DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
Inspection and Replacement of Exhaust Installation
Aviation Ground Power Unit (AGPU)
Headquarters, Department of the Army, Washington D. C.
16 July 2003
DISTRIBUTION STATEMENT A: Approved for public release, distribution is unlimited.
THIS PUBLICATION IS EFFECTIVE UNTIL RESCINDED OR SUPERSEDED.
1. PURPOSE. The purpose of this TB is to identify AGPUs that have leaking or defective exhaust
ejector assemblies and to authorize replacement of the original and modified ejector and inlet tube
assemblies with a new improved performance exhaust deflector installation. The new installation further
reduces the gas turbine engine (GTE) exhaust backpressure, yet maintains better draw to cool the
engine/generator compartment and the hydraulic fluid. Reduction in the exhaust backpressure increases
the available shaft horsepower, increases the pneumatic output, reduces the exhaust gas temperature,
and reduces the specific fuel consumption of the AGPU.
2. PRIORITY CLASSIFICATION. URGENT.
3. SUMMARY OF PROBLEM.
a. There have been reports that the AGPU exhaust ejector plenum have cracked or corroded to a
point that exhaust gas is leaking into the engine/generator compartment causing additional
b. Flu inlet tubes have broken free from the support plate and blown out of the flu.
The current GTE exhaust ejector installation causes excess backpressure that adversely affects
and hydraulic outputs).
d. The modified exhaust ejector and inlet tube assembles do not have sufficient draw to adequately
cool the hydraulic fluid.
* This TB supersedes TB 1-1730-229-30-1, dated 15 May 2000.