Applicable to: B22 and B25 (a ll versions)
Revision 1.3 – 02/24/ 2015
Manual B – Operations
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The power percentages expressed in the table refers to installations with a fixed pitch propeller
and it is supposed that the propeller, in flight, reaches the maximum permissible engine speed.
Exceeding the maximum allowable engine speed is a condition of potential risk to
the integrity of the engine and must be prevented by using propellers with
appropriate characteristics for power output
.
B.7.1.2. Fuel Pressure
The fuel pressure is detected by a sensor (optional) mounted on the shunt fuel. The fuel pressure
increases as the opening of the throttle control, and then the value of MAP.
Fuel Pressure [bar]
B
22D/B25D
B
22H/B25H
B
22L/B25L
B
22R/B25R
Max
3.6.
3.6
3.6
3.6
Min
2.9
2.9
2.9
2.9
Max variation with auxiliary pump on
0.15
0.15
0.15
0.15
B.7.1.3.C
The minimum value is reached in release conditions of release (low throttle and high engine
speed
).
In the case of pressures above or below the values shown, the engine operates
in an irregular manner. Do not fly until the proble m is identified and resolved.
It is mandatory to monitor the fuel pressure during the flight, in order to detect any
abnormalities that may affect safety.
It is strongly suggested to install an auxiliary fuel pump, to be used in case of
failure of the main pump in flight or in conditions of safety critical flight (takeoff
and landing).
B.7.1.3. Engine oil pressure
The engine oil pressure is read by a sensor placed on the main rail of the oil circuit, before the oil
filter and after the valve ADC. The oil pressure is strongly affected by the temperature and
viscosity of the oil.
Engine oil pressure [bar]
B
22D/B25D
B
22H/B25H
B
22L/B25L
B
22R/B25R
Max
2.2
2.2
2.2
2.2
Nominal @ max rpm
1.4÷1.8
1.7÷2.2
1.6÷2.0
1.7÷2.2
Min below 2500 (1400*) rpm
0.05
0.05
0.05
0.05
Max below 2500 (1400*) rpm
0.6
0.6
0.6
0.6
Min over 2500(1400*) rpm
1.2
1.2
1.2
1.2
Nominal @ 3000 rpm
1.5÷1.7
1.5÷1.7
1.5÷1.7
1.5÷1.7
B.7.1.4.C
* Engine version without reduction gear box
The oil pressure is electronically regulated below 2500 rpm (1400 rpm in versions without
gearbox). In case of an anomaly of the control system it is possible to read the oil pressure value
different from the one shown in idle conditions. Sometimes it may happen that there is an
increase in vibration to a minimum or below 2500 rpm during the first minutes of engine operation
