NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

0201-20-2300 January ±9$h 3003

MODIFICATION

OF

COCKPIT EXTENSION LAMP ASSEMBLY, TYPE B-7

by

Robert S» Rinkinen

Naval Aircraft Lighting Group

Photometry and Colorimetry Section

Optics and Metrology Division

NBS Test 21N- 78/53

Sponsored by

Lighting Section

EL-5211

Bureau of Aeronautics

Department of the Navy

Washington 25, D. C.

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publication, repi Approved for public release by the

1 part, Is prohibited

unless permission is c Director of the National Institute of ndards, Washington

25.D.C. Such perm Standards and Technology (NIST) art has been speclfltally prepared If th: on October 9, 2015 ort for Its own use,

1.

INTRODUCTION

This report describes the modification of a cockpit extension“lamp

assembly 'type B-7, to provide more effective strain Relief for the cable

entering the unit. This modification is designed so that it may be

fabricated easily at any naval field service center.

2.

MATERIAL

One cockpit extension lamp assembly type B-7, built to Air Force

Specification 9U-32228-A, was received at the National Bureau of

Standards on November 16, 195>3*

The assembly consists of a hand-held extensible floodlight, attached

by a cable to a spring loaded reel mounted in a fixed stowage unit. The

stowage unit is designed to hold the floodlight when the floodlight is

not in use. The cable in the unmodified floodlight unit is secured by

a split-washer type clamp. This clamp prevents the cable from pulling

loose, but does not prevent it from twisting at the base of the lamp

socket. This listing action evidently causes the insulation to fray

near the terminals and has resulted in numerous reports of failures in

service.

3.

DESCRIPTION OF MODIFICATION

Figure 1 is a photograph and Figure 2 a detailed drawing of a cable

clamp designed to use the fiber insulating strip between the two terminal

posts for a securing point. This clamp is adapted from the cable clamp

of a two-pin, series 300, in-line Jones electrical connector, (which may

be used, if available) modified in the following manner:

(a) A notch l/l6" wide and 1/811 deep is filed in the center of the

tip of each holding finger of the clamp. This notched section slides over

the insulating strip of the assembly, and prevents any twisting movement

of the clamp.

(b) The clamp is dimpled as shown in Figure 2 to insure a tighter

grip on the cable.

To prevent possible shorting against the cable clamp, it is recommended

that the stranded cable leads be soldered before assembly of the modified

clamp*
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