TD-163 ✔ Frederik

Question 1

1. The 701D engine on the UH-60M has the DECs or EDECUs that replace the ECUs found in the UH-60A. The DECs or EDECUs improve transient droop compensation how? Explain how and when the DEC limits TGT.

Answer 1

The DEC/EDECU receives signals from Nr and collective signals, these are compared with Np and TRQ signals. A priority signal is then processed to quickly trim the Torque motor in the HMU to compensate for the demand.

The DEC commands the HMU to limit fuel when TGT reaches its limiting value.
Dual engine TGT 879 +/- 9
Contingency TGT 903 +/- 10

Question 2

2. Explain when the EDECU limits TGT.

Answer 2

Dual engine TGT 879 +/- 9
Contingency TGT 903 +/- 10

On engines with the EDECU installed, the TGT will bypass the 10 minute limiter and limit at the 2.5 minute contingency power setting when any of the following conditions are met: NP drops below 96%; greater than 3% droop between reference NP and actual NP; greater than 5% per second NP droop rate exists and NP less than or equal to NP reference speed. Unlike the DEC, the EDECU is not dependent on the other engine’s Q being less than 50%.

Question 3

3. What are DEC/EDECU fault codes? How are DEC/EDECU fault codes displayed?

Answer 3

If a failure occurs on a selected input signal, the failed component or related circuit will be identified by a pre-selected fault code displayed as a Q code.

Question 4

4. Discuss the controls and functions of the digital ICS Panel.

Answer 4

The ICS panel provides audio interface for the communications radios, navigation radios, and intercommunication within the helicopter.

Question 5

5. The ICS panel on the UH-60M features a VOX feature, what are the procedures for adjusting the VOX sensitivity?

Answer 5

• Press the VOX pushbutton for less than one second causing it to flash
• Adjust the VOX sensitivity with the MVOL control

Question 6

6. What is the CAUTION associated with inserting the PCMCIA cards into the DTS?

Answer 6

Do not force PCMCIA cards into the DTS slot. Damage to the Data Transfer Unit (DTU) or PCMCIA card may occur. PCMCIA cards can only be inserted into the DTU with the “INSERT “ label facing aft.

Question 7

7. Discuss the hot start prevention system.

Answer 7

1. Automatically prevents overtemp during starting and shutdown.
2. Requires 400 Hz, 120 VAC
3. Requires signals form Np, Ng and TGT
4. Activates ODV when Ng less or equal 60%, Np less or equal 50% TGT greater or equal 900*C
5. Can be disabled by pressing and holding either Np overspeed test button during the start.

Question 8

8. If you experience IIMC are you required to inform the commander?

Answer 8

YES, you have violated airspace limits

AR 95-1

Question 9

9. When are operator and crew member checklists required to be used? When may they not be used?

Answer 9

Operator and crewmember checklist will be used for preflight through before leaving aircraft checks.

While airborne, when time not does permit use of the checklist or when its use would cause a safety hazard, required checks may be accomplished from memory.

AR 95-1