DC-9 auto-throttle

[x217]

I am new to the DC-9 panel and I have everything figured out, but when I set the autopilot the auto thrust doesn't work. By this I mean I set the yellow arrow on the speedometer to 250knots, but when I turn the auto trust on by the throttles i always keeps a constant speed at 210Knots. Can someone please help me and tell me how to work the DC-9 auto-throttle?


THANKS

[aerofoto - HJG Admin]

I have everything figured out, but when I set the autopilot the auto thrust doesn't work. By this I mean I set the yellow arrow on the speedometer to 250knots, but when I turn the auto trust on by the throttles i always keeps a constant speed at 210Knots. Can someone please help me and tell me how to work the DC-9 auto-throttle?

As covered in section 3:4.5 and Section 3:7.0 of our forum DC9 panel manual/DC9 PANEL INSTALLATION & HASNDLING NOTES, the AT system will not, and is not intended to, maintain a constant IAS/MACH during climb, cruise, and descent. The AT should only be used, if at all, during approaches to landing only .... and as direct per the following extracts from our forum manual ....

4.5: CENTER PEDESTAL PANEL - AUTO-THROTTLE SYSTEM LEVER

The CP Auto-Throttle system lever is the small white lever located below the yellow "RUD HYD CONT" lever. The DC9 Auto-Throttle system is used only during approaches to landing. The ASI V-REF bugs must be set prior to commencing any approach to landing. The CP AT lever must then be set to the "ENGAGED" position. When activated the AT system will respond by maintaining the aircraft at the calculated V-REF speed throughout the aircrafts approach to landing. The AT System works independently of the AP System. This AT system is not intended to be used inflight. It will not, and is not intended to, maintain the aircraft at a constant speed/MACH throughout climb/cruise/descent. The orange ASI speed bug is adjustable but has no function whatsoever in relation to AT coupled speed modes. The AT system will disconnect .... automatically .... upon ground contact after landing. FOR FURTHER INFORMATION REFER TO SECTION 7.0.

Mark C
AKL/NZ

[x217]

Thanks