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Pilot`s Notes Bf 109K-4 Aircraft Handbook

Bf 109K-4

Aircraft Handbook

art 9A General Equipment

IV. Oxigen System Installation
A. Description

Plan of the Oxygen System

Fig. 7: Plan of the Oxygen System

1. Oxygen-Spherical Cylinders

2. Support Beams

3. Stiffenirm Brackets

4. External Connector with

5. Shut-off Valve

6. Flow Valve

7. Check Valve

8. Demand Regulator

9. Pressure Gauge

10. O2 Monitor

11. Unit Console

12. Tubing Coupling

13. Tubing Coupling

14. Access Panel

15. Handhole Cover

For the Oxygen Breathing System the following equipment is installed:

3 Oxygen Supply Cylinders (Spherical Cylinders)

Check Valve

External Connector with Shut-off Valve

Demand Breathing Regulator

Flow Valve

O2 Monitor

Pressure Gauge will be replaced by an Cb indicator

The layout of the equipment for the oxygen system is shown in Illustration 7.

The 2-liter oxygen spherical cylinders are fastened to two support beams and are housed in the area between ribs 10 and 12 lit the right wing. Between ribs 10a and 10 a stiffening bracket is fastened on which the support beams are mounted.

The installation is filled through the external connector, which is accessible throimh a handhole on the wing; underside.

To prevent venting of oxygen from the external connector a check valve is installed in the fill line between the external connector and the oxvgen cylinders, in addition to the shut-off valve.

The demand regulator, pressure gauge, O2 monitor and flow valve are grouped in the unit console on the right side of the cockpit.

Oxygen is supplied in the normal mode by the demand regulator of the breathing system by opening the shut-off valve. The pressure gauge indicates the oxygen pressure in the system and the 02 monitor shows t lie proper operation of the breathing system Above 8000 meters the regulator of the breathing system supplies pure oxygen

The tubing of the system is marked with ID bands, a blue stripe with a white ring around each end.

B. Removal and Installation CAUTION!

During removal and installation of the oxygen system ensure that the system does not come into contact with oil and grease.

Before removal the oxygen is vented as follows: After closing the shut-off valve, loosen the pipe fitting after the valve or on the regulator. Then slowly opening the shut-off valve on the unit console and allow the O2 to flow out. After completely emptying the system, first unscrew the tubing couplings, Next, loosen the support beams from the stiffening brackets and remove the beams and attached

Unit Console in the Right Side of the Cockpit

Fig. 8: Unit Console in the Right Side of the Cockpit

1. Demand Regulator, 2. Flow Valve, 3. Pressure Gauge, 4. O2 Monitor, 5. Unit Console, 6. Decking (Right Instrument Console), 7. Push Button 02 Bypass , 6. Breathing Hose

For the removal of the unit console, first remove the instrument onsole next to the unit console. Nest unscrew the tubing couplings and he mounting screws and remove the unit console.

The installation of the breathing system follows in reverse order rom the removal.


When installing the tubing, check for correct flare and the presence of the thrust ring; also for undamaged inlet and threads.

C. Operation of the Oxygen System

Before flight put on the oxygen mask and check the breathing system for problem free operation. Use the oxygen system at altitudes above 4000 m; to do so open the oxygen flow valve. Watch pressure gauge and 02 flow monitor (especially if hit!).

To pressure check the oxygen mask, fold the hose and squeeze it together.

In case of breathing difficulties or oxygen emergencies, depress pushbutton momentarily a few times.

When finished with the oxygen system, close flow valve.

D. Filling the Oxygen System

Filling the oxygen system is done from the opening of the handhole cover beneath the external connector in the right wing. Momentarily blow out the external connector and high pressure line.

Attach the high pressure line of the oxygen fill equipment, open the shut-off valve.

After opening the flow valve, fill oxygen system to 165 Atm. (2425 p.s.i.) (Watch pressure gauge!).

Close shut-off valve and unscrew high pressure line of the oxygen fill equipment from the external connector Close handhole cover.

Note: Keep everything oil and grease free.

E. Inspection

Inspect the oxygen system for proper operation, satisfactory condition and mounting, see D. (Lift) 1205.

Check hose for cleanliness.

Dirt and moisture retained in the oxygen cylinders are removed by blowing out with oxygen.

To do this, disconnect the tubing connectors close to the cylinders.

Reconnect tubing.

Quick check:

Open flow valve, note oxygen pressure, close flow valve. Pressure may only drop at most 20 atm. in 20 minutes.

Inspection of the Complete Installation:

Open valve, note pressure; the pressure must be at least 100 atm. Allow the system to remain under pressure for a few hours. Oxygen pressure drop at most 10 atm.

If pressure drops, locate leaks (soapy water). Eliminate leaks by tightening the fittings. Check for proper flare.

If the seams leak, replace the tubing.

Inspection of the breathing equipment:

Check with Pressure Test Apparatus Fl 30453. If not available, then: open shut-off valve until maximum pressure is reached. Close flow valve. In 20 minutes pressure may only drop 20 atm.

With flow valve closed, operate O2 regulator bypass. Pressure gauge must drop immediately and the O2 monitor indicate.

F. Servicing

The tubing, where it is in contact with the grounding cables, must be kept bare.

Fuel, oil and especially grease must absolutely be kept away from the installation.

In servicing the Oxygen System, see D. (Luft) 1205 and D. (Luft) T. 5210.

V. Rescue and Safety Equipment
A. Description

For the pilot, a seat belt and shoulder harness are fitted to the scat. Both sets of straps are provided with a quick release buckle for emergency release.

2. Sea Survival Equipment

The pilot's seat is constructed so that the pilot can fly with the Sea Survival Kit (one-man life raft and accessories) (sec D.(Luft) T. 5201).

3. Emergency Landing Equipment

In the fuselage end (accessible through the manhole) a box is housed, which contains emergency landing rations and equipment

4. Flare Gun

A single shot flare gun, which is inserted into the mount on the right instrument cowling serves for ground communication. The ammunition is carried by the pilot in his flying suit.

The layout of the rescue and safety equipment is shown in Fig. 4.

VI. Fuel Windscreen Cleaning
A. Descriptionn

For cleaning the windscreen panels of oil film and dust, a hand op-crated windscreen cleaner is installed (see Fig. 9).

Operation of the windscreen cleaner is only permitted in flight.

Layout of the windscreen Cleaner

Fig. 9. Layout of the windscreen Cleaner

1. Handle 3. Spray tube

2. Valve 4. Cold Start valve

The valve is opened by means of a handle on the left of the instrument panel; thereby with the motor running, fuel under pressure in the tubing, sprays on the windscreen through the vents of the spray tubes positioned at the base of the windscreen. The fuel line for the windscreen cleaner is connected to the tee at the cold start valve (see Part 7A).

B. Installation and Removal

When changing engines, the required disconnect point is found on the left of the engine. Should the entire system be removed or installed, it is possible to accomplish this without special difficulty. Especially to be noted is that on installation of the spray tubes, they should be fastened to the base of the windscreen so that the windscreen will be properly sprayed with fuel.

C. Inspection and Servicing

The fuel windscreen cleaner system is checked bv ensuring that the holes of the spray tubes are not plugged, and so assuring that the windscreen will be sprayed with fuel in flight on operation of the handle and consequently will be cleaned.

VII. Armor Glass Heating
A. Description

To protect against fogging and icing, the armor windscreen can be heated electrically. The system is connected to the aircraft electrical circuit, but is safcticd by a switch operated by the retracted landing gear, so that the system can not be switched on while on the ground (see also Part , Section 1).