# AD 71-07-02: Obstacle Clearance Profile

- Type: Airworthiness directive
- Status: Current
- Products: Lockheed 1049-54, 1049B-55 (Navy R7V-1), 1049C-55, 1049D-55, 1049E-55, 1049F-55 (USAF C-121C), 1049G-82, 1049H-82, 149-46, 1649A-98, 49-46, 649-79 and 3 more
- Effective: April 3, 1971
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-1181
- Registered aircraft: 4 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/176680C50C4A46FB862569750048A149.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/71-07-02

## The airworthiness directive

71-07-02 LOCKHEED AIRCRAFT CORPORATION: Amdt. 39-1181. Applies to Lockheed Models 49, 149, 649, 749, 1049, and 1649 series airplanes certificated in all categories.

Compliance required prior to the first flight after May 3, 1971 unless already accomplished.

To provide for an acceptable obstacle clearance profile when computing the takeoff flight path, accomplish the following:

  (a) Revise the airplane flight manuals by adding to the airplane flight manuals listed in this subparagraph the following note to the lower right hand portion of the specified page and adjacent to that portion showing the ground time.

"NOTE: To obtain correct ground time, multiply ground time by 1.42."

Lockheed Model Lockheed Report No.

Page Identification 49-46 5817 Section II, Page 17, Figure 14 Appendix I, Part 2, Page 78, Figure 11 149-46 5817 Appendix V, Page 21, Figure 13 49-46

Appendix VI, Page 6, Figure 6

Appendix VI, Page 14, Figure 14 649-79 6028 Section II, Page 2-21, Figure 20 649A-79

Appendix 1, Part 1, Page I-24, Figure 17 749-79

Appendix 1, Part 2, Page I-50, Figure 45 749A-79

Appendix III, Page III-12, Figure 11

Appendix V, Page V-12, Figure 11 749-79 6028 Appendix III, Supplement A, Page IIIA-12, Figure 11 749A-79

1049-54 7787 Appendix II, Page II-17, Figure II-14 1049C-55 9154 Supplement A, Section III, Part 2, Page A-32.1, Figure A-25 1049E-55

Supplement A, Section III, Part 3, Page A-54.1, Figure A-47

Supplement A, Section III, Part 4, Page A-77, Figure A- 70 1049C 9153 Supplement A, Section III, Part 2, Page A-35, Figure A- 29, Sheet 2 1049E

Supplement A, Section III, Part 3, Page A-57, Figure A- 51, Sheet 2

Supplement B, Section III, Part 2, Page B-37, Figure B- 29, Sheet 2

Supplement B, Section III, Part 3, Page B-59, Figure B- 51, Sheet 2 1049C 9153 Supplement B, Section III, Part 4, Page B-83, Figure B- 74, Sheet 2 1049E

Supplement C, Section III, Part 3, Page C-35, Figure C- 29, Sheet 2

Supplement C, Section III, Part 4, Page C-56A, Figure C-52, Sheet 2

Supplement E, Section III, Part 2, Page E-31, Figure E- 24, Sheet 2

Supplement E, Section III, Part 3, Page E-57, Figure E- 48, Sheet 2 1049G-82 10051 Section IV, Part II, Page 4-38, Figure 4-34

Section IV, Part II, Page A4-38, Figure 4-34

Section IV, Part III, Page 4-59, Figure 4-54

Section IV, Part III, Page A4-59, Figure 4-54

DA-1 Supplement, Part 2, Page 33, Figure 29

DA-1 Supplement, Part 3, Page 54, Figure 50 1049G-82 10052 Section IV, Part II, Page 4-39, Figure 4-34

Section IV, Part II, Page A4-39, Figure 4-34

Section IV, Part II, Page B4-39, Figure 4-34

Section IV, Part II, Page C4-39, Figure 4-34

Section IV, Part III, Page 4-61, Figure 4-55

Section IV, Part III, Page A4-61, Figure 4-55

DA-1 Supplement, Section III, Part 2, Page 33, Figure 29

DA-1 Supplement, Section III, Part 3, Page 54, Figure 50

DA-3 Supplement, Section III, Part 2, Page 31, Figure 27

DA-3 Supplement, Section III, Part 3, Page 52, Figure 48 1049D 11020 Section IV, Part 2, Page A4-39, Figure 4-35 1049H

Section IV, Part 2, Page B4-39, Figure 4-35

Section IV, Part 2, Page C4-39, Figure 4-35

Section IV, Part 2, Page D4-39, Figure 4-35

Section IV, Part 2, Page E4-39, Figure 4-35

Section IV, Part 2, Page F4-39, Figure 4-35

Section IV, Part 3, Page A4-61, Figure 4-56

Section IV, Part 3, Page B4-61, Figure 4-56

Section IV, Part 3, Page C4-61, Figure 4-56

DA-1 Supplement, Section III, Part 2, Page A33, Figure 29

DA-1 Supplement, Section III, Part 3, Page A54, Figure 50

DA-1 Supplement, Section III, Part 2, Page 33, Figure 29 1049D 11020 DA-1 Supplement, Section III, Part 3, Page 54, Figure 50 1049H

DA-3 Supplement, Section III, Part 2, Page 31, Figure 27

DA-3 Supplement, Section III, Part 2, Page A31, Figure 27

DA-3 Supplement,Section III, Part 2, Page B31, Figure 27

DA-3 Supplement, Section III, Part 3, Page 52, Figure 48

DA-3 Supplement, Section III, Part 3, Page A52, Figure 48

DA-3 Supplement, Section III, Part 3, Page B52, Figure 48 1649A-98 11560 Section IV, Part 2, Page 4-31, Figure 4-23, Sheet 1

Section IV, Part 2, Page B4-31, Figure 4-23, Sheet 1

Section IV, Part 3, Page 4-52, Figure 4-43

Appendix II, Page II-29, Figure II-26

  (b) For the airplane flight manuals listed in this subparagraph there is a note in the top central portion of the page stating:

"These lines and this grid are used only in the determination of airplane height and distance at end of 2 minute period."

Add to this note the following:

CORRECTION: At the end of 2 minute period, correct the airplane height by subtracting 100 feet and the airplane distance by subtracting 3000 feet.

Lockheed Model Lockheed Report No.

Page Identification 1049C 9153 Section III, Supplement D,Part 2, Page D-39, Figure D-34, Sheet 2 1049E

Section III, Supplement D, Part 3, Page D-61, Figure D-55, Sheet 2

  (c) Reference this Airworthiness Directive in the airplane flight manual at the time of accomplishment.

This amendment becomes effective April 3, 1971.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 6A5](https://openairdocs.org/tcds/6A5): Lockheed Martin Aeronautics Company; names 8 of 8 models: 1049G-82, 1049C-55, 1049E-55, 1049F-55 (USAF C-121C), 1049D-55, 1049B-55 (Navy R7V-1), 1049H-82, 1049-54
- [TCDS A-763](https://openairdocs.org/tcds/A-763): Lockheed Martin Aeronautics Company; names 6 of 6 models: 149-46, 649-79, 749A-79, 749-79, 649A-79, 49-46
- [TCDS 4A17](https://openairdocs.org/tcds/4A17): Lockheed Martin Aeronautics Company; names 1 of 1 models: 1649A-98

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 4 (4 by airframe model, 0 by engine model)
- Makers: Lockheed 4

Models with the most aircraft:

- [Lockheed 49-46](https://openairdocs.org/model/lockheed-49-46): 1 aircraft (airframe model)
- [Lockheed 749-79](https://openairdocs.org/model/lockheed-749-79): 1 aircraft (airframe model)
- [Lockheed 1049H-82](https://openairdocs.org/model/lockheed-1049h-82): 1 aircraft (airframe model)
- [Lockheed 1649A-98](https://openairdocs.org/model/lockheed-1649a-98): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/71-07-02/models.md
Every aircraft: https://openairdocs.org/ad/71-07-02/aircraft.md

Its text cites no advisory circulars or STCs.

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