[49APU] APU引气压力有没有一个正常范围？

APU引气压力低

APU不开空调引气压力才14PSI，是不是太低了啊？

~（来自飞行员）

Please advise CEA the normal range of 737NG APU bleed air spanssure corresponding to no bleed air load, single air conditioning pack load, dual air conditioning packs load and engine start situations.

APU bleed air spanssure varies with outside air temperature, altitude and cabin temperature setting.

The following are normal APU bleed air spanssures at sea level:

-- No load 0-18 psig

-- 1 pack on 26 to 45 psig

-- Both packs on 8 to 40 psig.

-- Main Engine Start approx. 43 - 44 psig

Because of the wide spanssure band, do not use duct spanssure as the only parameter to evaluate the health of the APU. the parameters provided in the ref AMM 49-11-00/201, Table 203, APU Operating Limits should be used as aguide in determining APU performance.

Please note: For fuel saving, Boeing does not recommend operating a single air conditioning pack while the APU is used as the air source (see the ref /C/ SL for additional information).  

（SR 3-2624668790）