SA3189WE
Installation of United Air Lines NLG orifice support tube assembly P/N 6F13548-501 and -502 per FAA Approved United Air Lines Drawing No. 6F13548, Rev. "B" dated January 10, 1977, or later FAA approved revisions as an equivalent replacement for McDonnell Douglas NLG orifice support tube P/N 5598184 and 5717019. Held by United Airlines INC, which holds 520 approved modifications in all. Last revised November 30, 2011. System: other and general.
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
- Models
- DC-8F-54, DC-8-33, DC-8-62, DC-8-51, DC-8-61, DC-8-21, DC-8-52, DC-8-31
- Type certificates
- 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 20, 2026.