I guess Sikorsky once had the right stuff in their machines. This out of the UH-60 "little brother" of the 92 aircrew manual.
The lubrication
system includes two lubrication pumps that are combination
pressure and scavenge types operating in parallel. The
main transmission may run at cruise flight for 30 minutes
with loss of all oil.
The intermediate gear box may run at cruise flight for 30 minutes, with loss of all oil.
The tail gear box may run at cruise flight for 30 minutes with loss of all oil.
I still think it is more of a "get over on the right side of the fence" capability, not intended for extended overwater flights.
The emergency procedure states
MAIN XMSN OIL PRESS Caution Appears/
XMSN OIL PRESS LOW/XMSN OIL TEMP HIGH or
XMSN OIL TEMP Caution Appears. Loss of cooling
oil supply will lead to electrical and/or mechanical failure
of main generators. If the malfunction is such that oil
pressure decays slowly, the generators may fail before
MAIN XMSN OIL PRESS caution appears.
1. LAND AS SOON AS POSSIBLE.
If time permits:
2. Slow to 80 KIAS.
3. EMER APU START.
4. GENERATORS NO. 1 and NO. 2 switches -OFF
One gets the impression that still time is of the essence! ("If time permits")
The UH-60 can still be controlled by use of the electric back-up hydraulic pump, powered by the APU, even if both the transmission mounted pumps give up. As far as I have been told this is not the case with the 92. The electric hydraulic pump is only for ground checking of the flightcontrols, and inhibited in flight by the weight on wheels micro switch. Maybe a modification to this system might be in order, to have a last attemt at a semicontrolled ditch.
Torcher