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AD 55-15-06

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Airworthiness directive · Cooling Air System Rework · Lockheed 1049C-55, 1049D-55, 1049E-55 and 6 more

FAA copy· 21 KB
Download from FAA DRS
AboutSource files 1
Models
1049C-55, 1049D-55, 1049E-55, 149-46, 49-46, 649-79 and 3 more
Data sheets
TCDSA-763TCDS6A5
Registered aircraft
2 matched by model
Product
Aircraft · Large airplane

Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.

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The airworthiness directive

55-15-06 LOCKHEED: Applies to 049, 149 Aircraft, Serial Numbers 1963 Through 1980, 2021 Through 2088; 649-749 Aircraft, Serial Numbers 2503 Through 2590, 2610, 2611, 2614 Through 2618; 1049C Aircraft, Serial Numbers 4501 Through 4548; 1049E Aircraft, Serial Numbers 4549 Through 4555, 4558, 4559, and 4563 Through 4565; 1049D Aircraft, Serial Numbers 4163 Through 4166.

Compliance required by April 1, 1956, for Model 1049 aircraft and October 1, 1956, for Models 049/149 and 649/749 aircraft.

To improve the fire-resistance integrity of the above aircraft, revisions to the system supplying cooling air to the accessory section of the powerplant installation are considered necessary.

For 049-149 aircraft and 649-749 aircraft, the revision consists of installing a shutoff valve in a fireproof duct.

For the 1049C and E aircraft, the revision consists of replacing a section of aluminum duct between the oil cooler scoop, and the existing shutoff valve, with a fireproof duct. This section is in zone 1, and provides a possible zone 1 to zone 2 firepath.

Lockheed Service Bulletins 49/718, for 049/149 aircraft; 1049/2384, for 1049 aircraft; and 49/391A, for 649-749 aircraft, cover these subjects.

Affected TCDS · 2

The type certificate data sheets for the models this AD names, matched by model and maker.

TCDS A-763Lockheed Martin Aeronautics CompanyNames all 6 models: 149-46, 649-79, 749A-79 and 3 moreTCDS 6A5Lockheed Martin Aeronautics CompanyNames 3 of 8 models: 1049C-55, 1049E-55 and 1049D-55

Registered aircraft · 2

Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.

By aircraft maker
  • Lockheed2
By year built
19461949

By model

Aircraft

N749NLAircraft Guaranty Corp Trustee · Oklahoma City, OKBuilt 1949 · S/N 2604N9409HLas Vegas Hacienda Inc · Las Vegas, NVRegistration revokedBuilt 1946 · S/N 2047