737-200 EPR
 

Good day to all, hope someone can help. We have a 737-200 with no PDC, instead there is an odd contraption that will give you the different EPR when selected(T/O, CLB, CRZ, G/A) ,the selector also has a manual entry for the temperature. As for the indicator it will show the TAT and the requested EPR. Any info on this would be appreciated.
many thanks in advance

Are you talking about a circular slide rule ?

what do you want to know about it...certainly its covered in the POH.

the different abbreviations are for different phases of flight...and will produce the MAX epr for temp and phase of flight


takeoff, climb, cruise, go around.

enter the data (temp) and the phase of flight and you get the EPR.

.does it automatically move the epr bug? or do you have to set that after reading the output.

if you are flying the plane and don't know how to get the EPR, you can look it up in the tables in the book...the gadget takes less time than pulling out the book.

thanks to all for the replies. I did figure out most of it but would like to know who makes it (Honeywell?) so I could get my hand on an operation manual. The POH that came with the aircraft(imported) only talks about the PDC.
regards

Are you talking about the PDCS ?


looks like a small CDU with a rotary dial displaying different options and automatically driving the EPR bugs ?

Hi bf109,
I believe it was Lear Seigler.

Flight Management Computer "The PDCS was developed jointly by Boeing and Lear Seigler in the late 1970's. It enabled EPR and ASI bugs to be set by the computer and advise on the optimum flight level, all for best fuel economy. It was trialed on two in-service aircraft, a Continental 727-200 and a Lufthansa 737-200 for nine months in 1978 with regular line crews and a flight data observer. The 737-200 showed average fuel savings of 2.95% with a 2 minute increase in trip time over an average 71 minute flight. The 727 gave a 3.94% fuel saving because of its longer sector lengths. The PDCS quickly became standard fit and many were also retrofitted. By 1982 the autothrottle had been devised and thrust levers could be automatically driven to the values specified by the PDCS."

Does it look like this?
Flight performance data computer system

Who knows if there is even a manual. But...

TAT – Max EPR Indicator

Total Air Temperature Indicator
• indicates ambient air temperature corrected for compression heating (ram rise)
• flag indicates a system or electronic failure

Maximum EPR Indicator
• provides a continuous indication of the maximum allowable EPR for the mode selected
• uses temperature input from the total air temperature probe and pressure altitude input from
the air data computer
• automatically adjusts for the use of engine bleed air
• flag indicates a system failure

Mode Selector
ROTATE – Selects inflight mode for maximum EPR.
• GA - Go-around thrust
• Cont - Maximum continuous thrust
• Clmb - Maximum climb thrust
• CRZ - Maximum cruise thrust

Mode Indicator
Indicates the mode selected

PRESS TO TEST –

Drives the TAT and MAX EPR indicators to preset test values to test the
system.
Test Values:
MODE MAX EPR TAT
CRZ 1.85 +05.0
CLMB 1.94 +05.0
CONT 1.94 +05.0
GA 2.03 +05.0

thank you stilton and rudderrudderat but it is not a PDCS. Jammedstab thank you for the info. OK 465 even though the presentation of the instrument is not the same the essence of it is there. And to seeing the price of it shows the value of the bloody thing lol.
thanks to all