RVDT - thanks for the interesting details!!
Well - the description of SUP.20 pretty eliminates it from being the pump for the dual-hydraulic system would eliminate the use for the described fire-fighting system:
1 GENERAL
An optional mechanical power output on the MGB enables the installation of a supplementary hydraulic pump for specific use.
This output is driven by the MGB spiral bevel gear wheel with a speed of 6000 rpm for a corresponding NR of 386 rpm.
When the hydraulic pump is running off load (no specific equipment is using this specific hydraulic power), the power taken from the MGB must be less than 3 kW so as not to
affect the helicopter's performance.
2 LIMITATIONS
The limitations specified in the basic flight manual and in the flight manual supplements
remain applicable and are supplemented or modified by the following:
- Maximum power consumed by hydraulic pump on load .............. 32 kW,
- Maximum power consumed by hydraulic pump off load .............. 3 kW,
- The use of hydraulic power is prohibited:
in hover,
in climb,
in flight at IAS < 30 kt (56 km/h) and IAS > 80 kt (148 km/h).
3 EMERGENCY PROCEDURES
The emergency procedures specified in the basic flight manual and in the flight manual
supplements remain applicable and are supplemented or modified by the following:
- In case of engine failure or loss of power, IMMEDIATELY shut-down the specific
hydraulically powered system.
SO - there must have been some other application for that hydraulic pump drive....
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