SA3-258
C-O-Two visual smoke detector, Type A1-V, P/N 74800. Held by Northwest Airlines INC., which holds 24 approved modifications in all. Last revised June 3, 1958. System: emergency equipment.
What it applies to
- Kind of product
- Aircraft
- Design holder
- McDonnell Douglas Corporation; The Boeing Company; The Boeing Company
- Models
- DC-4, C54B-DC, C54A-DC
- Type certificates
- A-762, A-762, A-762
- On this site
- Douglas C-54 7 registered
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 21, 2026.