Form 337 instructions

1. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 1
FAA FORM 337
BALTIMORE FLIGHT
STANDARDS AIRWORTHINESS
GROUP

2. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 2
BLOCK 1 AIRCRAFT
uVERIFY INFORMATION IS COMPLETE
AND ACCURATE .
uCURRENT AIRCRAFT REGISTRATION
WILL PROVIDE THE REQUIRED
INFORMATION.

3. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 3
BLOCK 2 OWNER
uCURRENT AIRCRAFT REGISTRATION
WILL PROVIDE THE INFORMATION
REQUIRED.
uLAST NAME USUALLY APPEARS
FIRST FOR PRIVATE OWNERS.

4. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 4
BLOCK 3 FAA USE ONLY
uUSED BY FAA INSPECTOR WHEN A
FIELD APPROVAL IS REQUIRED.

5. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 5
BLOCK 4
UNIT IDENTIFICATION
uREFERENCE THE
BLOCK FOR THE
UNIT BEING
REPAIRED OR
ALTERED.
FOR EXAMPLE:
Installation of a different
model propeller is an
AIRFRAME
ALTERATION

6. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 6
BLOCK 4
uSTC NUMBERS
WILL REFERENCE
THE UNIT BEING
ALTERED
FOR EXAMPLE:
SA1234NE is
AIRFRAME
SE1234NE is ENGINE
SP1234NE is
PROPELLER

7. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 7
BLOCK 5 TYPE
uMAJOR REPAIRS AND ALTERATIONS
ARE DEFINED IN FAR PART43
APPENDIX A.
uPAR (a) MAJOR ALTERATIONS
uPAR (b) MAJOR REPAIRS

8. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 8
BLOCK 6
CONFORMITY STATEMENT
uBLOCK 6A: AGENCY’S NAME AND
ADDRESS
uMECHANICS - NAME AND
PERMENANT MAILING ADDRESS.
uMANUFACTURER’S AND REPAIR
STATIONS - NAME AND ADDRESS
UNDER WHICH BUSINESS IS DONE.

9. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 9
BLOCK 6
CONFORMITY STATEMENT
uBLOCK 6B: KIND OF AGENCY
uCHECK THE APPROPRIATE BOX TO
INDICATE CERTIFICATED MECHANIC
OR TYPE ORGANIZATION THAT
PERFORMED THE WORK.

10. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 10
BLOCK 6
CONFORMITY STATEMENT
uBLOCK 6C: CERTIFICATE NUMBER
uMECHANICS - CERTIFICATE NUMBER
uREPAIR STATIONS - AIR AGENCY
CERTIFICATE NUMBER AND RATING(S).
uMANUFACTURERS - TYPE PRODUCTION OR
STC NUMBER.
uMANUFACTURERS OF TSO APPLIANCES
ALTERING SHOULD ENTER TSO NUMBER
OF THE APPLIANCE ALTERED.

11. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 11
BLOCK 6
CONFORMITY STATEMENT
uBLOCK 6D: COMPLIANCE STATEMENT
uTHIS SPACE IS USED TO CERTIFY THAT THE
REPAIR OR ALTERATION WAS MADE IN
ACCORDANCE WITH THE FARS.
uCERTIFICATED MECHANIC - ENTER DATE
WORK COMPLETED AND SIGNATURE.
uREPAIR STATIONS - MAY AUTHORIZE
PERSONS IN THEIR EMPLOY TO DATE AND
SIGN THIS CONFORMITY STATEMENT.

12. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 12
BLOCK 7
APPROVAL FOR RETURN
TO SERVICE
uREMEMBER THE APPROVED AND
REJECTED BOXES.
uCHECK APPROVING AUTHORITY
uENTER CERTIFICATE NUMBER AS IT
APPEARS ON ENTITIES CERTIFICATE

13. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 13
BLOCK 8
REQUIRED INFORMATION
uCLEAR, CONCISE, AND LEGIBLE
STATEMENT DESCRIBING THE WORK
ACCOMPLISHED.
uDESCRIPTION OF THE REPAIR OR
ALTERATION, RELATIVE TO THE AIRCRAFT
OR COMPONENT.
uIDENTIFY AND DESCRIBE THE APPROVED
DATA USED AS THE BASIS FOR APPROVING
THE MAJOR REPAIR OR ALTERATION FOR
RETURN TO SERVICE.

14. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 14
APPROVED DATA
uTC DATA SHEETS
uAIRCRAFT SPECS
uSTC’s
uAD’s
uAPPLIANCE
MANUFACTURER’S
MANUALS
(excluding installation
instructions)
uMANUFACTURER’S
APPROVED DATA
(DOA)
uDER APPROVAL,
FAA FORM 8110-3
uDAS APPROVED
DATA

15. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 15
uAC43.13-1A: (Aircraft Inspection and
Repair section), may be used directly as
approved data without further approval
ONLY when there is no manufacturer
repair or maintenance instructions that
address the repair and the user has
determined that it is:
AC 65-19G
APPROVED DATA CONTINUED

16. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 16
uAPPROPRIATE TO THE PRODUCT
BEING REPAIRED ;
uDIRECTLY APPLICABLE TO THE
REPAIR BEING MADE ; AND
uNOT CONTRARY TO
MANUFACTURERS DATA
REMEMBER THIS APPROVAL APPLIES
ONLY TO REPAIRS !!!

17. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 17
ACCEPTABLE DATA
uINSTALLATION INSTRUCTIONS
uMAINTENANCE MANUALS
uADVISORRY CIRCULARS
uSERVICE BULLETINS
uSERVICE INSTRUCTIONS
uSERVICE LETTERS

18. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 18
BLOCK 8 RECOMMENDED
INFORMATION
uTOTAL TIME/”N” NUMBER
uIF ADDITIONAL SHEETS ARE
ATTACHED IDENTIFY THEM WITH
AIRCRAFT “N” NUMBER AND SERIAL
NO.

19. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 19
uDIAGRAMS AND DRAWINGS MAY BE
INCLUDED IF REQUIRED TO
ADEQUATELY EXPLAIN LOCATION
AND DETAILS OF THE REPAIR OR
ALTERATION
uREMEMBER TO MARK BLOCK IF
ADDITIONAL SHEETS ARE
ATTACHED

20. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 20
DISPOSITION AFTER
COMPLETION
u1 SIGNED COPY TO
OWNER/OPERATOR
u1 COPY TO FAA FSDO WITHIN 48
HOURS

21. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 21
EXTENDED RANGE FUEL
TANKS
uFAA FORM 337 AT LEAST IN TRIPLICATE.
u1 COPY ABOARD THE AIRCRAFT, (FAR
91.417)
u1 COPY FOR FAA FSDO
u1 SIGNED COPY TO THE OWNER
uNOTE: APPLICABLE TO TANKS INSTALLED
IN PASSENGER OR BAGGAGE
COMPARTMENT

22. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 22
ENGINES,PROPELLERS,
SPARE PARTS, OR
COMPONENTS

23. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 23
uCOMPLETE APPROVAL PORTION IN
DUPLICATE, LEAVING BLOCKS 1 & 2
BLANK
uATTACH 2 COPIES TO PART OR
COMPONENT UNTIL IT IS INSTALLED
ON AN AIRCRAFT
REQUIREMENTS OF
PERSONS PERFORMING
REPAIR OR ALTERATION

24. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 24
REQUIREMENTS OF
INSTALLER
uCOMPLETE BLOCKS 1 & 2 OF BOTH
ORGINALS.
uMAKE AN ENTRY IN THE AIRCRAFT
RECORDS MAKING REFERENCE TO THE
FAA FORM 337
uGIVE A SIGNED COPY TO THE OWNER AND
FORWARD A COPY TO THE FAA FSDO IN
THE AREA WHERE THE INSTALLER IS
OPERATING

25. BALTIMORE FLIGHT STANDARDS AIRWORTHINESS GROUP 25
REFERENCE MATERIAL
uFAR PART 43 APPENDIX A
uFAR PART 43 APPENDIX B
uAC 43.9-1E, INSTRUCTIONS FOR
COMPLETING FAA FORM 337
uAC 65-19G, INSPECTION
AUTHORIZATION KNOWLEDGE TEST
GUIDE