A4 Recurrent Training Engine Systems J-52-P408 &J-52-P6/P8.

A4 Recurrent Training

Engine SystemsJ-52-P408 &J-52-P6/P8

A4 Recurrent Training

• Introduce the major components of the J-52-P408 and the J-52-P8 TURBOJET ENGINE in the A-4N and TA-4.

• To familiarize the Transition Pilot with basic operation to include:

– Basic Engine Operation

– Associated ENGINE instruments & COCKPIT CONTROLS

– Operational procedures

– Engine Limits

– Emergency Procedures

Lesson Objectives

A4 Recurrent Training

Major Assemblies

A4 Recurrent Training

Inlet Guide Vane (A-4N Only)

A4 Recurrent Training

ANTI-ICE Switch

Right Outboard Wedge PanelA-4

TA-4Engine Anti-Icing System

A4 Recurrent Training

ENGINE DATA J-52-P-408B J-52-P-6B P-8 Weight (basic) 2318 lb 2032 lb Length (at room temperature) 118.870 inches Diameter (at room temperature) 31.357 inches Thrust (Military Rated) 11,200 lb 8,500 lb 9,200 High-pressure compressor - N2 (typical] Military Rated

12,200 RPM (98.8 percent tech) 11,460 RPM (98.8 percent tech)

High-pressure compressor - N2 12,353 rpm (100 % percent tach) 11,600 RPM (100 %) percent tach) low-pressure compressor - N1 (typical Military Rated)

10,400 rpm 9,750 rpm

Overspeed limit - N2 12,650 (102.4 percent tech) 11,900 (102.6 percent tech) Pressure ratio 14.6:1 13.6:1 Temperatures (maximum): P408 P6B P8 Starting 4550C 4550C 455 Idle 3400C 3400C 340 Normal 7050C 6020C 595 Military 7850C 6210C 650 Acceleration 8150 C 6600C 680 Fuel flow 0.89 lb TSFC 0.83 lb TSFC Pt4 pressure 214 psia 200 psia Tt4 temperature 7850F (approx.) 7600F (approx.) 1st stage turbine nozzle area 68.2 sq. in. 65.5 sq. in. 2nd stage low-pressure turbine nozzle area 156.6 sq. in. Tailpipe opening 1.79 sq. Ft (257.76 sq. in.) 1.93 sq ft (278.648 sq. in.)

J-52-P408/P6 COMPARISON

Note: Minimum RPM airborne for P-8 is 70%

A4 Recurrent Training

LUBRICATION SYSTEM

A4 Recurrent Training

OIL PRESSURE

A4 Recurrent Training

OIL QUANTITY

A4 Recurrent Training

Oil Press Light

INOP

A4 Recurrent Training

A-4 ENGINE IGNITION SYSTEM

The ignition timer energizes the igniters for a 30 to 45 second firing cycle. The momentary ignition switch, which is used to energize the ignition timer, is the switch actuated by movement of the throttle outboard.

A4 Recurrent Training

ENGINE FUEL SYSTEM

-The engine fuel system is designed to permit selection of desired engine power requirements at all operating altitudes and temperatures.-The system has two major components: The engine fuel pump and the fuel control.-Fuel is supplied to combustion chambers at pressures and flows necessary to meet these requirements.-Fuel is supplied from the tanks through necessary strainers and valves to engine driven fuel pump.-Fuel then passes through a fuel anti-icing system installed between the boost and main stages of the pump and is pumped to fuel control unit where it is metered in proper quantities.-Excess fuel is returned to the pump.

A4 Recurrent Training

FUEL ANTI-ICING

-When fuel in the aircraft fuel tanks becomes severely chilled, icing of the filter may occur, and obstruct fuel flow. A bypass valve will allow fuel to bypass filter if filter is obstructed.-Fuel anti-icing system prevents this icing condition by automatically warming fuel, using hot compressor discharge air. -Although fuel flows through heater at all times, airflow is prevented unless conditions require fuel heating.-Fuel temperature sensing element of air shutoff valve senses and controls fuel temperature at approximately 50 deg F (10 deg C)

A4 Recurrent Training

A4 Recurrent Training

ENGINE FIRE DETECTION SYSTEMFire Warning Light

TA-4 A-4N

FIRE

FIRE TAIL

FIRE

A4 Recurrent Training

Main Instrument Panel: Engine/Fuel

A-4N TA-4

A4 Recurrent Training

Manual Fuel Light

TA-4 A-4N

A4 Recurrent Training

STARTING THE ENGINE

GROUND CONTROLLED ENGINE START. 1. Pilot holds one finger vertically--P/C CONNECTS EXTERNAL POWER AND STARTS GTC2. ICS-----------------------------------CHECK3. Master press-to-test----------------CHECK4. Throttle -----------------------------OFF5. Pilot holds two fingers vertically-P/C OPENS GTC AIR VALVE6. Five-percent RPM, throttle--------IGN7. Fifteen-percent RPM, throttle-----IDLE8. At forty-five-percent RPM, three fingers held vertically------P/C CLOSE GTC AIR VALVE AND REMOVE STARTER AIR HOSE9. Stabilized idle RPM, pilot holds four fingers vertically-------P/C SELECTS INTERNAL ELECTRICAL POWER, SECURES POWER UNIT, REMOVES ELECTRICAL CABLE, SECURES ACCESS PANEL

A4 Recurrent Training

FLIGHT CREW CHECKLIST REVIEW

1. START MALFUNCTIONS2. ENGINE FIRE (GROUND/FLIGHT)3. HIGH/LOW ALTITUDE ENGINE FAILURE AND

AIRSTARTS: Note the procedural differences.4. CHUGS AND STALLS5. OIL PRESSURE AND QUANTITY MALFUNCTIONS6. FUEL CONTROL MALFUNCTION7. THROTTLE LINKAGE FAILURE