RAZBAM Metroliner III SA227-BC, Руководство по эксплуатации самолета

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RAZAIR ‐ A1 ‐ METRO ‐ III ‐ AFM ‐ 001
1 ‐ 24
Fig. 44 Engine START and STOP Buttons. Fig. 45 ENGINE STOP AND FEATHER Controls.
ENGINE TEMPERATURE MONITORING SYSTEM
An EGT gauge is provided for each engine for engine temperature monitoring (Figure 33). Below 80% rpm, compensated
EGT is displayed on the EGT indicators. Above 80% rpm, a computed EGT is displayed.
Below 80% rpm, the engine temperature signal proceeds to the EGT gauge without modification. Above 80% rpm, the
engine temperature signal is sent to the SRL for compensation. The computed EGT shows the pilot how close the engine
is to the maximum allowable. The maximum permissible computed EGT is 650
0
C for all operations except starting.
Display of EGT values for below 80% rpm and computed EGT values for operations above 80% rpm is controlled
automatically by the SRL ‐ Autostart computer. Two SRL Δ P/P switches (Figure 42) are provided for SRL activation.
Amber lights marked “L SRL OFF” and “R SRL OFF”, located on the annunciator panel, advise the pilot when raw EGT is
displayed on the EGT gauge or when the SRL computer is OFF. The SRL OFF light is normally illuminated below 805 rpm;
if a SRL OFF light is illuminated when rpm is over 80% a malfunction is indicated.
TEMPERATURE LIMITER SYSTEM
The system consists of a temperature limiter and a fuel bypass valve. The system functions automatically to limit EGT to
650
0
C by opening the fuel bypass valve and bypassing metered fuel back to the fuel pump. The temperature limiter is
integrated with the SRL computer. It is armed whenever the SRL switch is in the NORM (center) position and rpm is
above 90%. The system prevents EGT from exceeding the SRL value of 650
0
C.
Operation of the temperature limiter is indicated by the illumination of the respective BYPASS OPEN (Figure 19) light on
the instrument panel. The bypass valve may operate during takeoff. If the bypass valve opens during climb or cruise, the
power lever should be retarded until the BYPASS OPEN light extinguishes.
A switch marked “TEMP LMTR TEST,” “L” and “R” is located on the pilot’s left forward console, above the SRL switches. It
is used while on the ground to test the SRL/Limiter system.
NOTE
If the BYPASS OPEN light is illuminated during flight there is a small
possibility that the EGT slightly exceeds the 650
0
C value and trigger the
engine overtemp code. It is important to retard the power levers as soon
as possible to prevent engine loss