AD 48-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54A-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54B-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54D-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54E-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | C54G-DC | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
| aircraft | The Boeing Company | DC-4 | Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft |
Unsafe Condition
Emergency air brake valve front seizing due to infrequent operation.
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Required Actions
At intervals not to exceed 1,000 hours (or up to 1,700 hours at CAA Agent discretion), connect a gage to one brake port on each side, discharge the air brake cylinder, verify initial air pressure indications are not less than 400 p.s.i., allow 5 minutes for temperature-related pressure changes, and ensure pressure holds steadily for at least 5 minutes. Operate the other air brake control to confirm both pull mechanisms function properly.
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Compliance Time
At intervals not to exceed 1,000 hours, except at the discretion of the CAA Agent, the interval may be increased to coincide with a regular overhaul period, but should in no case exceed 1,700 hours.
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Affected Aircraft
Douglas C-54-DC and DC-4 Aircraft, including models C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, and DC-4.
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Federal Register Abstract
Emergency Air Brake
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_48-03-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-03-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft Subject: Emergency Air Brake Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | C54A-DC | C54B-DC | C54D-DC | C54E-DC | C54G-DC | DC-4 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: 48-03-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-03-02 SUBJECT HEADING: Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-03-02 DOUGLAS: Applies to All Models C-54-DC and DC-4 Aircraft. In order to prevent the emergency air brake valve front seizing due to infrequent operation, the following should be conducted: At intervals not to exceed 1,000 hours, except at the discretion of the CAA Agent, the interval may be increased to coincide with a regular overhaul period, but should in no case exceed 1,700 hours. Connect a gage to one brake port on each side of the airplane and discharge the air brake cylinder from one of the flight compartment controls. The initial air pressure indications on the gages at the brakes should not be less than 400 p.s.i. Allow 5 minutes for change in pressure due to temperature and again note the air pressure indications on the gages at the brakes. These second observed pressure indications should hold steadily for a period of at least 5 minutes. This will check the functioning of one of the pull mechanisms, the air brake control valve, shuttle valve, lines and fittings. Push in the control to release air pressure on brakes and operate other air brake control to insure that both pull mechanisms are operating properly. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_48-03-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-03-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft Subject: Emergency Air Brake Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | C54A-DC | C54B-DC | C54D-DC | C54E-DC | C54G-DC | DC-4 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: 48-03-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-03-02 SUBJECT HEADING: Airworthiness Directives; DOUGLAS C-54-DC and DC-4 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-03-02 DOUGLAS: Applies to All Models C-54-DC and DC-4 Aircraft. In order to prevent the emergency air brake valve front seizing due to infrequent operation, the following should be conducted: At intervals not to exceed 1,000 hours, except at the discretion of the CAA Agent, the interval may be increased to coincide with a regular overhaul period, but should in no case exceed 1,700 hours. Connect a gage to one brake port on each side of the airplane and discharge the air brake cylinder from one of the flight compartment controls. The initial air pressure indications on the gages at the brakes should not be less than 400 p.s.i. Allow 5 minutes for change in pressure due to temperature and again note the air pressure indications on the gages at the brakes. These second observed pressure indications should hold steadily for a period of at least 5 minutes. This will check the functioning of one of the pull mechanisms, the air brake control valve, shuttle valve, lines and fittings. Push in the control to release air pressure on brakes and operate other air brake control to insure that both pull mechanisms are operating properly. 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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