United States Army Aviation Warfighting Center
Fort Rucker, Alabama
December 2007
UH-60A
STUDENT HANDOUT
TITLE: UH-60A T700 ENGINE
4743-7
PROPONENT FOR THIS STUDENT HANDOUT IS:
110TH AVIATION BRIGADE
ATTN: ATZQ-ATB-AD-C
Fort Rucker, Alabama 36362-5000
FD5: This product/publication has been reviewed by the product developers in coordination with the USAAWC, Foreign Disclosure Officer, Fort Rucker, AL. foreign disclosure authority. This product is releasable to students from all requesting foreign countries without restrictions.
TERMINAL LEARNING OBJECTIVE
ACTION: Identify the operational characteristics, malfunctions, appropriate emergency procedures, and describe immediate actions pertaining to the UH-60 power plant systems.
CONDITIONS: In a classroom environment.
STANDARDS: Without references and in accordance with (IAW) TM 1-1520-237-10, TM 1-1520-237-CL, TC 1-237, and the student handout, correctly answer nine (9) out of twelve (12) questions from this scorable unit. If four (4) or more questions are answered incorrectly, the student will receive a No Go for this section of the criterion examination.
SAFETY REQUIREMENTS: Classroom: Use care when operating training aids or devises and handling components.
RISK ASSESSMENT: Low
ENVIRONMENTAL CONSIDERATIONS: None. However, it is the responsibility of all Soldiers and DA civilians to protect the environment from damage.
EVALUATION: Each student will be evaluated on this block of instruction during UH-60 Aircraft Systems Examination, Part 1. You must correctly answer Nine (9) out of twelve (12) questions to receive a GO.
1. LEARNING STEP 1: Identify the operational characteristics of the T-700 Engine.
a. Operational Description.
(1)
The General Electric T-700 engine is a front drive turboshaft type engine utilizing a gas generator, Gas Generator Speed (Ng), section consisting of a five stage axial and a single stage centrifugal flow compressor, an air cooled two stage axial flow high pressure turbine (44,700 rpm = 100% Ng speed), and a free or independent two stage un-cooled axial flow power turbine, Power Turbine Speed (Np).
(2)
The power turbine shaft, which has a rated speed of 20,900 rpm, 100% Np / Main Rotor Speed (Nr), is coaxial and extends to the front end of the engine where, via a splined joint, it is connected to the output shaft assembly for airframe engine power extraction.
b.
Operational Sections.
(1)
A thorough understanding of Ng and Np is key to understanding the cockpit controls, instruments, operational characteristics, and malfunction analysis of the T-700 engine.
(2)
Ng and Np are synonymous with N1 and N2; these abbreviations generally represent two operational sections common to all turboshaft engines, regardless of the manufacturer.
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