STC ST9091SC

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate This certificate issued to:

ST9091SC Honeywell International Inc.

1944 E Sky Harbor Circle N Phoenix, AZ 85034 .

the Federal Aviation Regulations T00001SE Make: Original Product Type Certificate Number:

Boeing 777-200 Series, 777-300 Series, 777-300 ER Series RECORE® Hamilton Sundstrand Condenser Reheater Heat Exchanger PN 810210-1, 810210-2 in accordance with Honeywell LORI Sealed Drawing List SDL3950-1 Rev. D, dated 17 November 2017 or later FAA approved revision.

1) Compatibility of this modification with previously installed equipment must be determined by installer.

2) 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.

April 8, 2011 Date Reissued:

October 1, 2021 Date of Issuance: Date Amended:

December 15, 2017 By Direction of the Administrator Signature:

William S. Shealy ODA Administrator, ODA-602216-NM

ST9091SC

ST9091SC Certification Basis:

a. The type certification basis for the Boeing Model 777 Series airplanes is reflected on TCDS T00001SE revision 27 for parts not changed or affected by the change.

b. The certification basis for parts changed or affected by the change since the reference date of the application, April 8, 2011, is based upon part 25 as amended by Amendment 25-133. Based on 14 CFR §§21.115 and 21.101, and the FAA policy for significant changes in FAA order 8110.48, the certification basis for this modification was determined to be:

Regulations at the latest amendment

Section Amdt.

25.603 25-46

25.605 25-46

25.1301(a) 25-123

25.1438(b) 25-41

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