leg5840 Posted February 12, 2024 Posted February 12, 2024 Observed phenomena: 1. For a simulation of both engine flame out, both engines were cut off at 350 knots/30,000 feet. 2. Following the engine cut off, both Engine RPM and the aircraft's speed decreased. RPM 56% under 3. As Both engine RPM fell below 56%, the Main generator went offline. 4. The Emergency generator operated using engine windmill as the power source (hydraulics, both UTL'). 5. Control of the aircraft was possible using the control stick. 6. Landing gears (LDG) operated normally in UP/DN positions according to the HANDLE position. 7. However, for some reason, the Standby airspeed indicator was stuck at 350 knots. (Q1.) RPM 16% under 8. When Both engine RPM dropped below 16%, the Emergency Generator lacked sufficient hydraulic pressure to operate, and the EMD turned OFF (likely causing all electrical signals to be lost). 9. Control of the aircraft was still possible using the control stick. 10. Due to the loss of electrical signals, the LDGs did not operate according to the HANDLE position. 11. Pulling the Emergency LDG HANDLE downed the LDGs normally. All hydraulic pressure out 12. At reduced aircraft speeds insufficient to generate hydraulic pressure through engine windmill, 13. Control of the aircraft was not possible using the control stick. 14. LDGs did not operate according to the HANDLE position. 15. Pulling the Emergency LDG HANDLE did not down the LDGs. (Q2) Questions: Q1. Is it normal for the Standby airspeed indicator not to operate when Both main generators and the emergency generator are offline? * T.O-1 clearly states that the standby airspeed indicator should function even when the emergency generator is in the ISOLATE state.(It seems like the emergency generator may not have been implemented correctly..) Q2. Is it normal for the LDGs not to deploy when pulling the Emergency LDG HANDLE in a situation where all hydraulics are unavailable? * From what I remember, even when all hydraulics are unavailable, pulling the Emergency LDG HANDLE, which is directly connected to the LDGs through mechanical cables, should 1. Release the LDG Lock by pressure from the JFS Accumulator, and 2. Deploy the LDGs if the speed is not too high to prevent deployment. I believe this is a bug and am posting this question on the bug forum.
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