From a B737NG typerating questionaire.
The minimum start pressure at 2000 ft above sea level (prior to starter engagement) is?
a) 39 psi
b) 29 psi
c) no limit
I can't find the answer in the operations manual or the flight crew training manual, but I found something on
http://www.b737.org.uk/powerplant.htm
Copy paste "Min duct pressure for start: 30psi at msl, -˝psi per 1000ft pressure altitude. Max: 48psi. "
However I am not sure if this is CL or NG.
This question is in a section called NG differences so it might be a trick question...
Any insights are highly appreciated.
Best regards
POL