AD 93-08-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-201 | Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-202 | Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-301 | Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-315 | Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes |
Unsafe Condition
Failure of the MLS wiring to provide a valid signal to the GPWS could result in an incorrect GPWS alert or no alert, leading to a potential controlled flight into terrain (CFIT) accident.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the MLS wiring and associated connectors for damage or degradation. Correct any discrepancies found in accordance with the approved maintenance procedures. Revise the AFM to include operational limitations for MLS/GPWS interface.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
De Havilland Model DHC-8 Series airplanes installed with MLS equipment and GPWS systems.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Microwave Landing System (MLS) Wiring/Link to Ground Proximity Warning System (GPWS) Inspection
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_93-08-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-08-08 Document Type: AD Final Rules Docket Number: 92-NM-144-AD Subject Heading: Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes Subject: Microwave Landing System (MLS) Wiring/Link to Ground Proximity Warning System (GPWS) Inspection Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/26/1993 Make: Bombardier Inc. Model: DHC-8-101 | DHC-8-102 | DHC-8-103 | DHC-8-106 | DHC-8-201 | DHC-8-202 | DHC-8-301 | DHC-8-311 | DHC-8-315 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: 93-08-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 92-NM-144-AD AMENDMENT: 39-8555 AD NUMBER: 93-08-08 SUBJECT HEADING: Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes ACTION: SUMMARY: DATES: Effective May 26, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-08-08 DE HAVILLAND, INC.: Amendment 39-8555. Docket 92-NM-144-AD. Applicability: Model DHC-8 series airplanes equipped with microwave landing system (MLS) provisions, as listed in de Havilland Service Bulletin S.B. 8-34-60, Revision 'C,' dated November 1, 1991; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent the airplane from landing short of the runway, accomplish the following: (a) Prior to installation of an MLS, or within 45 days after the effective date of this AD, whichever occurs later, perform a general visual inspection to determine whether the vertical deviation wiring has been properly installed and/or connected to link the MLS with the ground proximity warning system (GPWS), in accordance with de Havilland Service Bulletin S.B. 8-34-60, Revision 'C,' dated November 1, 1991. (1) If any vertical deviation wiring has been found that has not been properly installed and/or connected to link the MLS with the GPWS, prior to further flight, correct the wiring and perform a functional test of the system in accordance with the service bulletin. (2) If vertical deviation wiring has been found that has been properly installed and/or connected to link the MLS with the GPWS, no further action is necessary. (b) 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, New York Aircraft Certification Office (ACO), FAA, Engine and Propeller Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO. (c) 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. (d) The inspection, wiring correction, and functional test shall be done in accordance with de Havilland Service Bulletin S.B. 8-34-60, Revision 'C,' dated November 1, 1991. 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. Copies may be obtained from de Havilland, Inc., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Engine and Propeller Directorate, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on May 26, 1993. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_93-08-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 93-08-08 Document Type: AD Final Rules Docket Number: 92-NM-144-AD Subject Heading: Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes Subject: Microwave Landing System (MLS) Wiring/Link to Ground Proximity Warning System (GPWS) Inspection Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/26/1993 Make: Bombardier Inc. Model: DHC-8-101 | DHC-8-102 | DHC-8-103 | DHC-8-106 | DHC-8-201 | DHC-8-202 | DHC-8-301 | DHC-8-311 | DHC-8-315 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: 93-08-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 92-NM-144-AD AMENDMENT: 39-8555 AD NUMBER: 93-08-08 SUBJECT HEADING: Airworthiness Directives; De Havilland Model DHC-8 Series Airplanes ACTION: SUMMARY: DATES: Effective May 26, 1993. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 93-08-08 DE HAVILLAND, INC.: Amendment 39-8555. Docket 92-NM-144-AD. Applicability: Model DHC-8 series airplanes equipped with microwave landing system (MLS) provisions, as listed in de Havilland Service Bulletin S.B. 8-34-60, Revision 'C,' dated November 1, 1991; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent the airplane from landing short of the runway, accomplish the following: (a) Prior to installation of an MLS, or within 45 days after the effective date of this AD, whichever occurs later, perform a general visual inspection to determine whether the vertical deviation wiring has been properly installed and/or connected to link the MLS with the ground proximity warning system (GPWS), in accordance with de Havilland Service Bulletin S.B. 8-34-60, Revision 'C,' dated November 1, 1991. (1) If any vertical deviation wiring has been found that has not been properly installed and/or connected to link the MLS with the GPWS, prior to further flight, correct the wiring and perform a functional test of the system in accordance with the service bulletin. (2) If vertical deviation wiring has been found that has been properly installed and/or connected to link the MLS with the GPWS, no further action is necessary. (b) 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, New York Aircraft Certification Office (ACO), FAA, Engine and Propeller Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO. (c) 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. (d) The inspection, wiring correction, and functional test shall be done in accordance with de Havilland Service Bulletin S.B. 8-34-60, Revision 'C,' dated November 1, 1991. 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. Copies may be obtained from de Havilland, Inc., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Engine and Propeller Directorate, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on May 26, 1993. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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