SA1033WE
Installation of either single or dual Collins AL-101 Radio Altimeter System(s) in accordance with FAA Approved United Air Lines Report Nos. F-1038 and No. F-1054. Held by United Airlines INC, which holds 520 approved modifications in all. Last revised November 30, 2011. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company
- Models
- DC-8-21, DC-8-31, DC-8-32, DC-8-33, DC-8-51, DC-8-52, DC-8-53, DC-8-55, DC-8F-54
- Type certificates
- 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25
- 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 22, 2026.