SA2174WE
Installation of pallet assembly40550-101, -102, -103, -104 and-105 used in conjunction with net assemblies 22362-51 or AMF 306-60120-1. (720-29C, -30C, -62C, -51C, -180C, -31C, -25C, -27C) (707-351C, -338C, -323C, -331C, -336C, -337C, -329C, -373C, -330 C, -327C, -385C. Held by Brooks & Perkins, INC, which holds 29 approved modifications in all. Last revised May 16, 1975. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company
- Models
- 707, 720
- Type certificates
- 4A26, 4A28
- On this site
- Boeing 707 9 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.