# STC SA5531NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Ancra International LLC, United States
- Description: Installation of lower compartment centerline guide/restraint.
- Applied: January 8, 1991
- Status date: September 3, 2019
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE)
- Certificate PDF: https://openairdocs.org/files/sha256/20/79/2079b820f712df6a28c8996321ba5f4b2f301ed94f15c051adc08b37bc7920ce
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/91AC445B16A1DCE6862585DE00494305.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA5531NM

## ADs that name it (0)

None.

## Approved models (4)

- The Boeing Company 747-100 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-200 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-300 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-400 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

Ancra International LLC 601 South Vincent Avenue Azusa, CA 91702 25 .

Description of Type Design Change: Installation of lower compartment centerline guide/restraint in accordance with FAA approved Ancra Controlled Drawing List DL 80516, Revision “N/C”, dated January 7, 1990, or later FAA approved revision.

Limitations and Conditions: The installation should not be incorporated in any aircraft unless it is determined that the interrelationship between this change and any previously approved configuration will not introduce any adverse effect upon the airworthiness of the aircraft. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

January 8, 1991

March 4, 1992

October 8, 1996; March 29, 2912; September 3, 2019

(Signature) Manager, Technical & Administrative Support Section Los Angeles ACO Branch (Title) A20WE

Boeing

747-100, -200, -300, -400 Series

## Every issue (2)

- September 3, 2019: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/20/79/2079b820f712df6a28c8996321ba5f4b2f301ed94f15c051adc08b37bc7920ce)
- March 29, 2012: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/de/96/de96ceb776c801d4763e25db56b75259af5c680bdf3ec7086eb630365404e4d6)

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