AD 48-43-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Martin-Marietta Corporation | 202 | Martin Model 202 Aircraft |
Unsafe Condition
Excessive hydraulic fluid leakage from system emergency and flap synchronizer bypass valves, nose gear steer-valve, hydraulic test outlet dustcaps, main and landing gear pressure relief valves, 24ST aluminum alloy tubing in hydraulic lines, and accumulator/pressure ports of the system unloading valve.
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Required Actions
Replace specified valves and dustcaps with new parts, install safety wiring on pressure relief valves, replace 24ST tubing with 61ST tubing, and install proper size AN 6246 leather backup rings at specified ports.
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Compliance Time
As soon as practicable, but not later than January 1, 1949
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Affected Aircraft
Martin-Marietta Corporation Model 202 Aircraft, all serial numbers
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Federal Register Abstract
Hydraulic System Rework
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_48-43-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-43-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Martin Model 202 Aircraft Subject: Hydraulic System Rework Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Martin-Marietta Corporation Model: 202 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 48-43-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-43-01 SUBJECT HEADING: Martin Model 202 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-43-01 MARTIN: Applies to All Model 202 Aircraft. To be accomplished as soon as practicable, but not later than January 1, 1949. In order to eliminate excessive hydraulic fluid leakage, the following shall be accomplished: 1. Replace the system emergency and flap synchronizer bypass valves, P/N 2021A82089, (HydroAire No. 4010) with new valves P/N 2021A82089-01 (HydroAire No. 4030). (This same subject is covered by GLM Maintenance Note No. 89.) 2. Replace the nose gear steer-valve P/N 2021A80590, by new valve P/N's 2021A23493, 2021A23508 or 2021A82131. (This same subject is covered by GLM Service Bulletin No. 46.) 3. Replace the two hydraulic test outlet dustcaps, P/N's 155-32-10 and 155-32-20, by new sealing caps, P/N's 2021A82133 and 2021A82134. (This same subject is covered by GLM Maintenance Note No. 88.) 4. Install safety wiring on main and landing gear pressure relief valves, Airex Nos. D-1068-3500 and 1265-900. (This same subject is covered by GLM Service Bulletin No. 67.) 5. Replace all 24ST aluminum alloy tubing used in 3,000 p.s.i. hydraulic pressure lines with new 61ST tubing. (This same subject is covered by GLM Service Bulletin No. 66.) 6. Install proper size AN 6246 leather backup rings at the accumulator and pressure ports of the system unloading valve, Vickers Model AA-34582, at the ports of the emergency brake Valve Bendix No. 146251 and at all other ports where a universal type fitting connection is used. (GLM Standard Practice Sheet No. 35028 describes the correct method of assembling these connections.) FOOTER:
Document Text
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AD Final Rules - DRS_48-43-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-43-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Martin Model 202 Aircraft Subject: Hydraulic System Rework Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Martin-Marietta Corporation Model: 202 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: 48-43-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-43-01 SUBJECT HEADING: Martin Model 202 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-43-01 MARTIN: Applies to All Model 202 Aircraft. To be accomplished as soon as practicable, but not later than January 1, 1949. In order to eliminate excessive hydraulic fluid leakage, the following shall be accomplished: 1. Replace the system emergency and flap synchronizer bypass valves, P/N 2021A82089, (HydroAire No. 4010) with new valves P/N 2021A82089-01 (HydroAire No. 4030). (This same subject is covered by GLM Maintenance Note No. 89.) 2. Replace the nose gear steer-valve P/N 2021A80590, by new valve P/N's 2021A23493, 2021A23508 or 2021A82131. (This same subject is covered by GLM Service Bulletin No. 46.) 3. Replace the two hydraulic test outlet dustcaps, P/N's 155-32-10 and 155-32-20, by new sealing caps, P/N's 2021A82133 and 2021A82134. (This same subject is covered by GLM Maintenance Note No. 88.) 4. Install safety wiring on main and landing gear pressure relief valves, Airex Nos. D-1068-3500 and 1265-900. (This same subject is covered by GLM Service Bulletin No. 67.) 5. Replace all 24ST aluminum alloy tubing used in 3,000 p.s.i. hydraulic pressure lines with new 61ST tubing. (This same subject is covered by GLM Service Bulletin No. 66.) 6. Install proper size AN 6246 leather backup rings at the accumulator and pressure ports of the system unloading valve, Vickers Model AA-34582, at the ports of the emergency brake Valve Bendix No. 146251 and at all other ports where a universal type fitting connection is used. (GLM Standard Practice Sheet No. 35028 describes the correct method of assembling these connections.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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