What it approves
Application of a deep compressive stress layer using a Low Plasticity Burnishing (LPB) process on CFM56-7 Series Engines Stage 1 High Pressure Compressor (HPC) Blade Dovetails in accordance with Delta Air Lines Inc. Drawing No. 72-0396, Revision B, dated November 3, 2011, or later FAA Approved revision.
What the certificate says
From the PDF’s text layer, without the form’s printed wording. Layout and order may differ; the PDF is the record.
Part 33 of the Code of Federal Regulations See Type Certificate Data Sheet. Nos. E00055EN or E00056EN for complete certification basis.
Application of a deep compressive stress layer using a Low Plasticity Burnishing (LPB) process on CFM56-7 Series Engines Stage 1 High Pressure Compresso r (HPC) Blade Dovetails in accordance with Delta Air Lines Inc. Drawing No. 72-0396, Revision B, dated November 3, 2011, or later FAA Approved revision.
1. Compatibility of this design change with previously approved modifications must be determined by the installer.
2. The 1st Stage HPC blades modified in accordance with this STC can only be installed in engine models specifically listed in the attached AML.
3. Any weld repairs or thermal heat treatments exceeding 600 degrees F require the LPB process to be re-applied.
4. The 1st Stage HPC blades, part numbers P331P01, P331P02, P331P03, P331P04, P 331P06, & P331P07 modified by STC SE03036CH cannot be intermixed with P391P02, P391P05 & P391P06 part number blades.
5. A facility that performs the LPB process in accordance with this STC must be FAA Approved.
6. Delta Air Lines, Inc. Instructions for Continued Airworth iness (ICA), for HPC blades modified in accordance with STC SE03036CH, FAA Accepted on December 14, 2011, or later FAA Accepted revision is required.
7. If the holder agrees to permit another pers on to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.
...End...
This certificate and the supporting data, which is the basis for approva l, shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration.
Delta Air Lines Inc.
1775 Aviation Blvd Atlanta, GA 30320-6001 E00055EN, E00056EN
CFM International, S.A. Make :
Model : See AML Date reissued :
Original Signed By:
Timothy Smyth
(Signature) Timothy Smyth Manager, Propulsion Branch Chicago Aircraft Certification Office
(Title) Date of application: November 24, 2010
Date of issuance: December 14, 2011
Limitations and Conditions (Continued)
ADs that name this STC · 0
An AD can apply because an STC is installed, or mention one in its text.
Approved models · 30
| Make | Model | Data sheet |
|---|---|---|
| CFM International S.A. | CFM56-7B20 | E00055EN |
| CFM International S.A. | CFM56-7B20/2 | E00055EN |
| CFM International S.A. | CFM56-7B20/3 | E00055EN |
Every issue · 1
DRS keeps each issue of an STC as its own record, with its own certificate and attachments.
| Date | Status | Files |
|---|---|---|
| December 14, 2011 | Issued, current | CertificateApproved model list |