AD 51-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| 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
Show captured applicability text from the source AD
AD Final Rules - DRS_51-20-01.html Copy URL 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:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_51-20-01.html Copy URL 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
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