AD 73-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maule Aerospace Technology, Inc. | M-4-180C | Airworthiness Directives; Maule Models M-4-180 and M-4-220 |
| aircraft | Maule Aerospace Technology, Inc. | M-4-220C | Airworthiness Directives; Maule Models M-4-180 and M-4-220 |
| aircraft | Maule Aerospace Technology, Inc. | M-4-220S | Airworthiness Directives; Maule Models M-4-180 and M-4-220 |
Unsafe Condition
Engine overheat during climb and incorrect cylinder head temperature reading
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install Maule slug P/N 6002B-3 in No. 4 cylinder head thermocouple hole; relocate cylinder head temperature sender to No. 4 cylinder head; install engine top baffle Maule P/N 5031X-3, all in accordance with specified service letters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours' time in service after the effective date of this airworthiness directive
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Maule Models M-4-180C (serial numbers 3001C through 3006C, 3002C through 3006C), M-4-220S (serial number 2001S), and M-4-220C (serial numbers 2135C through 2175C, 2177C; 2001C through 2126C, 2129C through 2175C, 2177C; 2053C through 2126C, 2129C through 2175C, 2177C)
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Engine Overheat
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_73-11-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-11-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Maule Models M-4-180 and M-4-220 Subject: Engine Overheat Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/29/1973 Make: Maule Aerospace Technology, Inc. Model: M-4-180C | M-4-220C | M-4-220S Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 73-11-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1646 AD NUMBER: 73-11-06 SUBJECT HEADING: Airworthiness Directives; Maule Models M-4-180 and M-4-220 ACTION: SUMMARY: DATES: Effective May 29, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-11-06 MAULE: Amdt. 39-1646. Applies to Models M-4-180 and M-4-220 certificated in all categories as indicated below. Compliance required within the next 50 hours' time in service after the effective date of this airworthiness directive. To prevent possible engine overheat during climb and to obtain a correct cylinder head temperature reading accomplish the following or an equivalent approved by Chief, Engineering and Manufacturing Branch, Southern Region: 1. For Model M-4-220C serial numbers 2135C through 2175C and 2177C: Install Maule slug P/N 6002B-3 in the No. 4 cylinder head thermocouple hole in accordance with Maule Service Letter No. 25. The slug is to be installed prior to relocation of cylinder head sender unit. 2. For Model M-4-180C serial numbers 3001C through 3006C; Model M-4-220S, Serial Number 2001S; Model M-4-220C; Serial Numbers 2001C through 2126C, 2129C through 2175C, and 2177C: Relocate the cylinder head temperature sender to the No. 4 cylinder head in accordance with Maule Service Letter No. 24. 3. For Model M-4-180C, Serial Numbers 3002C through 3006C, and Model M-4-220C Serial Numbers 2053C through 2126C, 2129C through 2175C and 2177C: Install engine top baffle, Maule P/N 5031X-3, in accordance with Maule Service Letter No. 26. This amendment becomes effective May 29, 1973. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_73-11-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 73-11-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Maule Models M-4-180 and M-4-220 Subject: Engine Overheat Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/29/1973 Make: Maule Aerospace Technology, Inc. Model: M-4-180C | M-4-220C | M-4-220S Product Type: Aircraft Product Subtype: Small 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: 73-11-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1646 AD NUMBER: 73-11-06 SUBJECT HEADING: Airworthiness Directives; Maule Models M-4-180 and M-4-220 ACTION: SUMMARY: DATES: Effective May 29, 1973. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 73-11-06 MAULE: Amdt. 39-1646. Applies to Models M-4-180 and M-4-220 certificated in all categories as indicated below. Compliance required within the next 50 hours' time in service after the effective date of this airworthiness directive. To prevent possible engine overheat during climb and to obtain a correct cylinder head temperature reading accomplish the following or an equivalent approved by Chief, Engineering and Manufacturing Branch, Southern Region: 1. For Model M-4-220C serial numbers 2135C through 2175C and 2177C: Install Maule slug P/N 6002B-3 in the No. 4 cylinder head thermocouple hole in accordance with Maule Service Letter No. 25. The slug is to be installed prior to relocation of cylinder head sender unit. 2. For Model M-4-180C serial numbers 3001C through 3006C; Model M-4-220S, Serial Number 2001S; Model M-4-220C; Serial Numbers 2001C through 2126C, 2129C through 2175C, and 2177C: Relocate the cylinder head temperature sender to the No. 4 cylinder head in accordance with Maule Service Letter No. 24. 3. For Model M-4-180C, Serial Numbers 3002C through 3006C, and Model M-4-220C Serial Numbers 2053C through 2126C, 2129C through 2175C and 2177C: Install engine top baffle, Maule P/N 5031X-3, in accordance with Maule Service Letter No. 26. This amendment becomes effective May 29, 1973. 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.
Related Airworthiness Directives
98-15-18 R1
final ruleAirworthiness Directives; Maule Aerospace Technology, Inc. Airplanes
Unsafe Condition: Internal corrosion of wing lift struts, part numbers 2079E and/or 2080E, could result in reduced structural integrity.
2008-24-02
final ruleAirworthiness Directives; Maule Aerospace Technology, Inc. M-4, M-5, M-6, and M-7 Series and Model M-8-235 Airplanes
Unsafe Condition: Reversed elevator control rigging could result in elevator movement in the opposite direction from control input, leading to loss of control.
2000-09-06
final ruleAirworthiness Directives; Maule Aerospace Technology, Inc. M-4, M-5, M-6, M-7, MX-7, and MXT-7 Series Airplanes and Models MT-7-235 and M-8-235 Airplanes
Unsafe Condition: Improper crimping of the Nicopress™ sleeve terminal ends could cause a control cable to slip from the sleeve, potentially leading to loss of rudder, elevator, aileron, or flap control.
84-09-07
final ruleAirworthiness Directives; Maule Model M-4 and M-5 Series Airplanes
Unsafe Condition: Plug type drain fittings in the main and auxiliary fuel tanks may fail to provide a convenient means to drain fuel system water contamination.
