rparigor(at)suffolk.lib.n
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 Posted: Wed Mar 08, 2006 12:05 pm Post subject: 914 operations with wastegate closed Question kinda answered |
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OK I talked with Lockwood today about 914 Operators manual:
"Take-off (as per RTCA DO 178 B - with inactive TCU)
It is kinda sorta like "Emergency War Power" as used on a P-51, however
only for take offs.
The computer of the 914 has exclusive rights to open the wastegate, either
for good, or no good reasons.
If making a life critical take off depending on max power, if all of a
sudden it was not there, that would not be a good thing.
Thus on a take off that depends on max power being available,
recommendation is to place TCU-switch in "OFF" position so computer can
not reduce power.
Here is the exact wording, I think it may be in wrong order:
10.3.6.2) Take-off (as per RTCA DO 178 B - with inactive TCU)
- Take-off performance until the boost pressure stabilizes within the
limits of operation.
- TCU-switch in "OFF" position.
- Shift throttle lever to 115% (take-off performance).
- After reaching the critical altitude switch on the TCU.
- The auxiliary fuel pump may be switched off after the take-off.
This does not quite make sense to me, it sounds better like:
10.3.6.2) Take-off (as per RTCA DO 178 B - with inactive TCU)
- Shift throttle lever to 115% (take-off performance).
- Wait until the boost pressure stabilizes within the limits of operation.
- TCU-switch in "OFF" position.
- After reaching the critical altitude switch on the TCU.
- The auxiliary fuel pump may be switched off after the take-off.
Any comments?
Ron Parigoris
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