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STUDENT GUIDE T-39N/G NATOPS
UNIT FOUR: HYDRAULIC SYSTEMS
REFERENCE: T-39 NATOPS MANUAL
ENABLING OBJECTIVE:
A-1.  Locate and operate T-39N/G aircraft systems, given a mission in a T-39 in accordance with
NATOPS.
ENABLING STEP:
A.1.5. Recall the basic descriptions, related and operating limitations of the T-39N/G hydraulic
systems.
NATOPS FOUR: HYDRAULIC SYSTEMS
A. Main hydraulic system (3,000 psi system)
1. Components:
a. Electric motor driven pump (paralleling bus)
b. Hydraulic reservoir (2 gal.)
c. Accumulator (1500 + 50 psi nitrogen pre-charge)
d. Hydraulic pump switch
e. Cockpit-pressure gauge (2650-3200 psi)
2. Operates landing gear, main gear doors, speedbrake, wheelbrakes/anti-skid, thrust
reversers and NWS.
B. Controls and indicators
1. Switch positions
a. MANUAL - pump runs continuously; 1 minute time limit. Spring-loaded to AUTO.
b. AUTO - pump ON when pressure < 2700 psi until pressure returns to 3000 psi.
c. OFF&RESET - OFF position/resets power if tripped by overtime or overcurrent.
2. HYD PRESS PWR OFF LIGHT
a. Pressure < 2700 for more than 1 minute.
b. Switch is in OFF&RESET position.
c. Pump CB out (2A3 & 2A4).
HYDRAULIC SYSTEMS
4-1


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