Specifications

[P-51D Mustang]

DCS

EAGLE DYNAMICS

2. Engine Driven Pump

3. Unloading and Relief Valve

4. Pressure Accumulator

5. Landing Gear Control Valve

6. Fairing Door Control Valve

7. Wing Flap Control Valve

8. Landing Gear Operating Strut

9. Fairing Door Operating Strut

10. Wing Flap Operating Strut

11. Emergency Release Valve

12. Check Valves

13. Master Brake Cylinders

14. Disc-type Brake

In the main power system, a pump is permanently geared to the engine and maintains a pressure of

800-1100 lbs/sq.in. As long as the engine is running, the engine unloading valve loads the hydraulic

system when hydraulic pressure drops to 800-850 lbs. It unloads the system when hydraulic pressure

reaches 1050-1100 lbs. In the event of hydraulic pump failure, no provision is made for emergency

operation of the wing flaps.

Incorporated into the hydraulic system on all P-51 model aircraft is an Landing Gear Fairing Door

Emergency Release handle. The purpose of this handle when pulled out is to release or bypass

hydraulic pressure from the fairing door cylinders and lines back directly to the reservoir. After the

knob has been pulled out and has served its purpose, pushing it back in will once again restore

normal operation of the hydraulic system. Therefore, if emergency landing gear procedure has been

followed, push the knob back to attempt normal operation of the flaps. If flaps fail to extend, no

emergency procedure is available.

Oil System

The oil system includes a tank just forward of the firewall and a radiator in the air scoop under the

fuselage. The full capacity of the oil system is 21 U.S gallons. The tank is a hopper type - that is, it is

designed with hoppers or compartments which facilitate quick warm-up and also make it possible to

fly the aircraft in adverse attitudes or with little oil in the system.

With this tank, the P-51 can be flown in any attitude when the tank is full. The aircraft can also be

put into a vertical climb or dive when the tank is only 1/4 full and it will continue to provide proper

lubrication. However, when the aircraft is in inverted flight, the oil pressure falls off, because no oil

reaches the scavenger pump. For this reason, inverted flight must be limited to 10 seconds.