AD 93-11-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
Unsafe Condition
Degradation of lift due to ice accumulation on the wing leading edge, which can cause significant reduction in stall angle-of-attack and increase stall speed up to 30 knots beyond the stall warning activation speed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the AFM Limitations Section to include cautionary notes and procedures for checking ice/frost/snow; modify the bleed air anti-ice system or install a supplemental ice protection system within 9 months after the effective date; and revise AFM operating procedures after modification.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 days after January 17, 1992 (for AFM revision under paragraph (a)), and within 9 months after the effective date (July 22, 1993) for modifications under paragraph (c).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F series airplanes, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
AFM Limitations
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_93-11-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-11-01 Document Type: AD Final Rules Docket Number: 92-NM-48-AD Subject Heading: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes Subject: AFM Limitations Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/22/1993 Make: The Boeing Company Model: DC-9-11 | DC-9-12 | DC-9-13 | DC-9-14 | DC-9-15 | DC-9-15F 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: 93-11-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 92-NM-48-AD AMENDMENT: 39-8593 AD NUMBER: 93-11-01 SUBJECT HEADING: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes ACTION: SUMMARY: DATES: Effective July 22, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-11-01 MCDONNELL DOUGLAS: Amendment 39-8593. Docket 92-NM-48-AD. Supersedes AD 92-03-01, Amendment 39-8155. Applicability: Model DC-9-11, -12, -13, -14, -15, and -15F series airplanes, certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent degradation of lift due to ice accumulation on the wing leading edge, accomplish the following: (a) Except as provided by paragraph (b) of this AD, within 10 days after January 17, 1992 (the effective date of AD 92-03-01, Amendment 39-8155), revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to include the following. This may be accomplished by inserting a copy of this AD in the AFM. "Wing De-icing Prior to Takeoff CAUTION The Model DC-9-10 series airplane has a wing design with no leading edge high lift devices, such as slats. Wings without leading edge devices are particularly susceptible to loss of lift due to wing icing. Minute amounts of ice or other contamination (equivalent to medium grit sandpaper) on the leading edges or wing upper surfaces can cause a significant reduction in the stall angle-of-attack. This can increase the stall speed up to 30 knots. The increased stall speed can be well above the stall warning (stick shaker) activation speed. [END OF CAUTIONARY NOTE] The leading edge and upper wing surfaces must be physically checked for ice/frost when the airplane has been exposed to conditions conducive to ice/frost formation. Takeoff may not be initiated unless the flight crew verifies that a visual check and a physical (hands-on) check of the leading edge and upper wing surfaces have been accomplished, and that the wing is clear of ice/frost/snow accumulation. Icing/frost/snow conditions exist when the Outside Air Temperature (OAT) is below 6 degrees C (42 degrees F); and either the difference between the dew point temperature and OAT is less than 3 degrees C (5 degrees F), or visible moisture (rain, drizzle, sleet, snow, fog, etc.) is present. NOTE This limitation does not relieve the requirement that aircraft surfaces are free of ice, frost, and snow accumulation as required by Federal Aviation Regulations Sections 91.527 and 121.629. [END OF NOTE]" (b) Paragraph (a) of this AD does not apply to any airplane that is both operated in accordance with Federal Aviation Regulation (FAR) 121.629(c), Amendment 121-231, and modified in accordance with either paragraph (c)(1) or (c)(2) of this AD. (c) Within 9 months after the effective date of this amendment, accomplish the procedures specified in either paragraph (c)(1) or (c)(2) of this AD: (1) Modify the bleed air anti-ice system so that it can operate on the ground to prevent ice reformation on the wing leading edges after ground equipment has been utilized to properly deice the airplane, and to minimize the effect of undetected ice/frost/snow contamination. Accomplish the modification in accordance with a method approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Or (2) Install a supplemental on-ground wing leading edge ice protection system in accordance with McDonnell Douglas DC-9 Service Bulletin 30-65, dated October 8, 1992. (d) Upon the accomplishment of the modification required by paragraph (c) of this AD, revise the AFM in accordance with either paragraph (d)(1) or (d)(2) of this AD: (1) Revise the Limitations section to include appropriate operating procedures relative to operation of the modification required by paragraph (c) of this AD. These operating procedures must be approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Or (2) Revise the Limitations section to include the following operating procedures relative to the operation of the modification required by paragraph (c) of this AD. This may be accomplished by inserting a copy of this AD in the AFM. "Use of Bleed Air Anti-Ice System CAUTION The Model DC-9-10 series airplane has a wing design with no leading edge high lift devices, such as slats. Wings without leading edge devices are particularly susceptible to loss of lift due to wing icing. Minute amounts of ice or other contamination (equivalent to medium grit sandpaper) on the leading edges or wing upper surfaces can cause a significant reduction in the stall angle-of-attack. This can increase the stall speed up to 30 knots. The increased stall speed can be well above the stall warning (stick shaker) activation speed. [END OF CAUTIONARY NOTE] The bleed air anti-ice system must be on whenever icing conditions exist or are anticipated, when on the ground, until immediately prior to commencement of takeoff roll." (e) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. (f) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (g) The installation of a supplemental on-ground wing leading edge ice protection system shall be done in accordance with McDonnell Douglas DC-9 Service Bulletin 30-65, dated October 8, 1992. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51, as of July 22, 1993 (58 FR 33898, June 22, 1993). Copies may be obtained from McDonnell Douglas Corporation, P.O. Box 1771, Long Beach, California 90846-1771, Attention: Business Unit Manager, Technical Administrative Support, Dept. L51, Mail Code 2-98. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Transport Airplane Directorate, Los Angeles Aircraft Certification Office (ACO), 3229 East Spring Street, Long Beach, California; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (h) This amendment becomes effective on July 22, 1993. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_93-11-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-11-01 Document Type: AD Final Rules Docket Number: 92-NM-48-AD Subject Heading: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes Subject: AFM Limitations Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/22/1993 Make: The Boeing Company Model: DC-9-11 | DC-9-12 | DC-9-13 | DC-9-14 | DC-9-15 | DC-9-15F 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: 93-11-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 92-NM-48-AD AMENDMENT: 39-8593 AD NUMBER: 93-11-01 SUBJECT HEADING: Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes ACTION: SUMMARY: DATES: Effective July 22, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-11-01 MCDONNELL DOUGLAS: Amendment 39-8593. Docket 92-NM-48-AD. Supersedes AD 92-03-01, Amendment 39-8155. Applicability: Model DC-9-11, -12, -13, -14, -15, and -15F series airplanes, certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent degradation of lift due to ice accumulation on the wing leading edge, accomplish the following: (a) Except as provided by paragraph (b) of this AD, within 10 days after January 17, 1992 (the effective date of AD 92-03-01, Amendment 39-8155), revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to include the following. This may be accomplished by inserting a copy of this AD in the AFM. "Wing De-icing Prior to Takeoff CAUTION The Model DC-9-10 series airplane has a wing design with no leading edge high lift devices, such as slats. Wings without leading edge devices are particularly susceptible to loss of lift due to wing icing. Minute amounts of ice or other contamination (equivalent to medium grit sandpaper) on the leading edges or wing upper surfaces can cause a significant reduction in the stall angle-of-attack. This can increase the stall speed up to 30 knots. The increased stall speed can be well above the stall warning (stick shaker) activation speed. [END OF CAUTIONARY NOTE] The leading edge and upper wing surfaces must be physically checked for ice/frost when the airplane has been exposed to conditions conducive to ice/frost formation. Takeoff may not be initiated unless the flight crew verifies that a visual check and a physical (hands-on) check of the leading edge and upper wing surfaces have been accomplished, and that the wing is clear of ice/frost/snow accumulation. Icing/frost/snow conditions exist when the Outside Air Temperature (OAT) is below 6 degrees C (42 degrees F); and either the difference between the dew point temperature and OAT is less than 3 degrees C (5 degrees F), or visible moisture (rain, drizzle, sleet, snow, fog, etc.) is present. NOTE This limitation does not relieve the requirement that aircraft surfaces are free of ice, frost, and snow accumulation as required by Federal Aviation Regulations Sections 91.527 and 121.629. [END OF NOTE]" (b) Paragraph (a) of this AD does not apply to any airplane that is both operated in accordance with Federal Aviation Regulation (FAR) 121.629(c), Amendment 121-231, and modified in accordance with either paragraph (c)(1) or (c)(2) of this AD. (c) Within 9 months after the effective date of this amendment, accomplish the procedures specified in either paragraph (c)(1) or (c)(2) of this AD: (1) Modify the bleed air anti-ice system so that it can operate on the ground to prevent ice reformation on the wing leading edges after ground equipment has been utilized to properly deice the airplane, and to minimize the effect of undetected ice/frost/snow contamination. Accomplish the modification in accordance with a method approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Or (2) Install a supplemental on-ground wing leading edge ice protection system in accordance with McDonnell Douglas DC-9 Service Bulletin 30-65, dated October 8, 1992. (d) Upon the accomplishment of the modification required by paragraph (c) of this AD, revise the AFM in accordance with either paragraph (d)(1) or (d)(2) of this AD: (1) Revise the Limitations section to include appropriate operating procedures relative to operation of the modification required by paragraph (c) of this AD. These operating procedures must be approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Or (2) Revise the Limitations section to include the following operating procedures relative to the operation of the modification required by paragraph (c) of this AD. This may be accomplished by inserting a copy of this AD in the AFM. "Use of Bleed Air Anti-Ice System CAUTION The Model DC-9-10 series airplane has a wing design with no leading edge high lift devices, such as slats. Wings without leading edge devices are particularly susceptible to loss of lift due to wing icing. Minute amounts of ice or other contamination (equivalent to medium grit sandpaper) on the leading edges or wing upper surfaces can cause a significant reduction in the stall angle-of-attack. This can increase the stall speed up to 30 knots. The increased stall speed can be well above the stall warning (stick shaker) activation speed. [END OF CAUTIONARY NOTE] The bleed air anti-ice system must be on whenever icing conditions exist or are anticipated, when on the ground, until immediately prior to commencement of takeoff roll." (e) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. (f) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (g) The installation of a supplemental on-ground wing leading edge ice protection system shall be done in accordance with McDonnell Douglas DC-9 Service Bulletin 30-65, dated October 8, 1992. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51, as of July 22, 1993 (58 FR 33898, June 22, 1993). Copies may be obtained from McDonnell Douglas Corporation, P.O. Box 1771, Long Beach, California 90846-1771, Attention: Business Unit Manager, Technical Administrative Support, Dept. L51, Mail Code 2-98. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Transport Airplane Directorate, Los Angeles Aircraft Certification Office (ACO), 3229 East Spring Street, Long Beach, California; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (h) This amendment becomes effective on July 22, 1993. 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
2025-09-11
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: The discovery of jammed elevators during takeoff could result in the inability of the airplane to rotate at rotation speed V<NF>R<INF>, and lead to a rejected takeoff and high-speed runway excursion.
2024-20-02
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: cracked and severed structure found in the aft fuselage cant bulkhead at STA 1178.225 and vertical stabilizer rear spar installation, on a Boeing Model 717-200 airplane, and similar structure on Bo...
2023-12-15
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: 5G C-Band interference can cause radio altimeters to not perform their intended function, resulting in increased flightcrew workload while on approach with the flight director, autothrottle, or aut...
2023-10-02
final ruleAirworthiness Directives; Transport and Commuter Category Airplanes
Unsafe Condition: Radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground (e.g., landing flare), could lead to loss of continued safe flight and landing. Additional...