AD 51-20-01

final rule

CURTISS-WRIGHT Model C-46 Series Aircraft

AD Number
51-20-01
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Unknown
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
aircraft Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation C-46A CURTISS-WRIGHT Model C-46 Series Aircraft
aircraft Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation C-46D CURTISS-WRIGHT Model C-46 Series Aircraft
aircraft Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation C-46F CURTISS-WRIGHT Model C-46 Series Aircraft
aircraft Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation C-46R CURTISS-WRIGHT Model C-46 Series Aircraft
aircraft Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation C-46E CURTISS-WRIGHT Model C-46 Series Aircraft
aircraft Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation C-46/CW20-T CURTISS-WRIGHT Model C-46 Series Aircraft
aircraft Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Aircraft Corporation | Skyways International Trading and Transport Co. | Tempo Design Corporation Super C-46/CW20-T CURTISS-WRIGHT Model C-46 Series Aircraft

Unsafe Condition

Electrical fire hazard in the pilot's compartment due to the C-4 cockpit light rheostat assembly.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Rework the C-4 cockpit light rheostat assembly per Figure 2, fabricate insulator strip as per Figure 2(a), install as shown in Figure 2(b), and revise wiring to the C-4 lamp assembly as shown in Figure 3.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

within 100 hours' time in service after the effective date of this amendment unless already accomplished

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Curtiss-Wright Model C-46 Series aircraft equipped with C-4 Cockpit Light Assembly

AI-generated summary from the source AD text. Verify against the official source before acting.

Federal Register Abstract

Cockpit Light

Applicability Source Text

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AD Final Rules - DRS_51-20-01.html
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AD Number:
51-20-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
CURTISS-WRIGHT Model C-46 Series Aircraft
Subject:
Cockpit Light
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Air...Show more
Model:
C-46A | C-46D | C-46F | C-46R | C-46E | C-46/CW20-T | Super C-46/CW20-T
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:
AIRWORTHINESS DIRECTIVES FINAL RULES: 51-20-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   51-20-01

SUBJECT HEADING:   CURTISS-WRIGHT Model C-46 Series Aircraft

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:   51-20-01 CURTISS-WRIGHT Applies to Model C-46 Series aircraft equipped with C-4 Cockpit Light Assembly.

Compliance required within 100 hours' time in service after the effective date of this amendment unless already accomplished.

To eliminate an electrical fire hazard existing in the pilot's compartment, the following rework must be accomplished:

1. Rework the C-4 cockpit light rheostat assembly in accordance with Figure 2. Fabricate insulator strip per Figure 2(a), and install as shown in Figure 2(b).




SECTIONAL VIEW OF COCKPIT LIGHT CASE - TYPE C-4A & C-4, WITH RHEOSTAT INSULATOR INSTALLED
FIGURE 2

(U.S.A.F.T.O. No. 03-5G-12, dated September 8, 1950, covers this same subject.)

2. Revise the wiring to the C-4 lamp assembly as shown in Figure 3.



(Page 410D, Figure 301B of AN 01-25L-2 covers this same subject.)

Revised December 28, 1964.

FOOTER:

Document Text

Show stored source text (verify against official source)
AD Final Rules - DRS_51-20-01.html
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Print/Save as PDF
Document Versions
 Feedback
Details
AD Number:
51-20-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
CURTISS-WRIGHT Model C-46 Series Aircraft
Subject:
Cockpit Light
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
Airlift International, Inc. | Curtiss-Wright Corporation | Flying Tiger Line, Inc. | L. B. Smith Air...Show more
Model:
C-46A | C-46D | C-46F | C-46R | C-46E | C-46/CW20-T | Super C-46/CW20-T
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:
AIRWORTHINESS DIRECTIVES FINAL RULES: 51-20-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   51-20-01

SUBJECT HEADING:   CURTISS-WRIGHT Model C-46 Series Aircraft

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:   51-20-01 CURTISS-WRIGHT Applies to Model C-46 Series aircraft equipped with C-4 Cockpit Light Assembly.

Compliance required within 100 hours' time in service after the effective date of this amendment unless already accomplished.

To eliminate an electrical fire hazard existing in the pilot's compartment, the following rework must be accomplished:

1. Rework the C-4 cockpit light rheostat assembly in accordance with Figure 2. Fabricate insulator strip per Figure 2(a), and install as shown in Figure 2(b).




SECTIONAL VIEW OF COCKPIT LIGHT CASE - TYPE C-4A & C-4, WITH RHEOSTAT INSULATOR INSTALLED
FIGURE 2

(U.S.A.F.T.O. No. 03-5G-12, dated September 8, 1950, covers this same subject.)

2. Revise the wiring to the C-4 lamp assembly as shown in Figure 3.



(Page 410D, Figure 301B of AN 01-25L-2 covers this same subject.)

Revised December 28, 1964.

FOOTER:

Source: Official FAA Source ↗

Retrieved: Apr 8, 2026

Rights: U.S. Government Public Domain

This site is not affiliated with or endorsed by the FAA. Always verify with official sources.

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