ST509A, Both DC-9 P/N's are part of McDonnell DouglasNext Assembly 5956942.

Specifications

Part Number

ST509A, Both DC-9 P/N's are part of McDonnell DouglasNext Assembly 5956942.

Manufacturer

AMETEK Aerospace

ATA ChapterMaintenance system chapter

21 — Air Conditioning

CapabilitySystem area (hydraulics, avionics, landing gear…)

Avionics / Electronics

Inventory ClassRotable, expendable, or consumable

Rotable

Certification

PMA

Aircraft Category

Narrow-Body

Criticality

Standard

Airframe Applicability(1)

Data Sources(1)

• FAA PMA

  https://drs.faa.gov/browse/excelExternalWindow/B88128F16DAD0BC5862577AB004B1932.0001
  2026-03-07