MIL-HDBK 1028/6A
Table 4
Summary of Design Method for Quantities and Ratings, Central
Facilities Equipment Selection, and Environmental Control Air System
BASIS OF DETERMINATION FOR RECOMMENDED UNIT
CAPACITY AND NUMBER OF EQUIPMENT UNITS:
Step
Description
1.
Number and type of aircraft:
2.
Aircraft service requirements:
ECS air = lb/min psig (per engine)
Electrical = kVA, Hz
3.
Aircraft to be served simultaneously:
Total number of aircraft = aircraft to be served
Diversity factor
4.
Number and location of services to be provided:
Preconditioned air = number, hangar
ECS air = number, flight line (aircraft served less
number, hangar)
Electrical = number, hangar
Electrical = number, flight line
5.
System capacity:
ECS air compressor capacity:
Number, flight line x lb/min x specific vol. scf/min
Electrical:
Number aircraft x kVA/aircraft = kVA
6.
Equipment unit size:
Total system capacity (Item 5) = unit capacity
*Number of unit modules
Select manufacturer's standard size that meets or
exceeds unit capacity calculated.
* Recommended number of unit modules is four. (For large capacity systems,
the preferred compressor selection is three units at 25 percent system
total with the fourth module divided into two units at 12.5 percent each.)
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