AD 48-26-01

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AD Number:
48-26-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
LOCKHEED Models 649 and 749 Series Aircraft
Subject:
Engine Speed Restrictions-Curtiss Prop
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
Lockheed Aircraft Corporation
Model:
649-79 | 749-79
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
Updated RGL applicability to match AD applicability; CAR C-11-185
AIRWORTHINESS DIRECTIVES FINAL RULES: 48-26-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   48-26-01

SUBJECT HEADING:   LOCKHEED Models 649 and 749 Series Aircraft

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
48-26-01 LOCKHEED: Applies to 649 and 749 Series Aircraft Equipped With Curtiss C632S-A14/850-4C2-0 Propellers.

Compliance required by July 7, 1948, and August 1, 1948.

To avoid failures under certain operating conditions, the following engine speed restrictions must be observed and two placards covering these restrictions must be installed in the cockpit. (Temporary placards must be installed not later than July 8, 1948, and permanent placards to be supplied by Lockheed installed not later than August 1, 1948.) One placard must be in full view of the pilots and one in full view of the flight engineer. Placards should read as follows:

"In flight avoid continuous operation below 1,625 r.p.m. and between 1,725 and 1,850 r.p.m., 1,900 and 2,000 r.p.m., and between 2,100 and 2,375 r.p.m. On ground avoid continuous operation between 1,200 and 1,450 r.p.m." For visual reference, all tachometers in the airplane must be marked as follows not later than August 1, 1948: "Red Band 1,200 to 1,625 r.p.m. Green band 1,625 to 1,725 r.p.m. with green radial line at 1,675 r.p.m. Red band 1,725 to 1,850 r.p.m. with green radial line at 1,875 r.p.m. Red band 1,900 to 2,000 r.p.m. Green band 2,000 to 2,100 r.p.m. with green radial line at 2,050 r.p.m. Red band 2,100 to 2,375 r.p.m. with green radial line at 2,400 r.p.m. Yellow band 2,400 to 2,800 r.p.m. with red radial line at 2,800 r.p.m."

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