Source: https://ntsb.gov/investigations/AccidentReports/_layouts/ntsb.recsearch/Recommendation.aspx?Rec=A-91-090
Timestamp: 2019-09-23 08:59:08
Document Index: 505198134

Matched Legal Cases: ['ARTS 23', 'ART 25', 'ARTS 23', 'ART 25', 'ART 25', 'ART 25', 'ARTS 23', 'ART 25', 'ART 25', 'ARTS 23']

Safety Recommendation A-91-090
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REVISE ADVISORY CIRCULAR (AC) 20-73, "AIRCRAFT ICE PROTECTION," AND AC 23.1419-1, "CERTIFICATION OF SMALL AIRPLANES FOR FLIGHT IN ICING CONDITIONS," TO INCLUDED GUIDANCE FOR THE FULFILLMENT OF 14 CFR PARTS 23.1416(C) AND 25.1416(C) BY ENSURING THAT PNEUMATIC PRESSURE THRESHOLD AT WHICH EACH DEICE BOOT INDICATION LIGHT IS DESINGED TO ILLUMINATE IS SUFFICIENT PRESSURE FOR EFFECTIVE PNEUMATIC DEICE BOOT OPERATION.
Date Closed: 1/12/2000
Response: THE SAFETY BOARD HAS REVIEWED THESE AC'S AND FINDS THAT THEIR ISSUANCE MEETS THE INTENT OF A-91-90; THEREFORE, IT IS CLASSIFIED "CLOSED--ACCEPTABLE ALTERNATE ACTION."
Response: ON 8/19/98, THE FAA ISSUED ADVISORY CIRCULAR (AC) 23.1419-2A, CERTIFICATION OF SMALL AIRPLANES FOR FLIGHT IN ICING CONDITIONS. THE AC INCLUDES GUIDANCE TO ENSURE THAT THE PNEUMATIC PRESSURE THRESHOLD AT WHICH EACH DEICE BOOT INDICATION LIGHT IS DESIGNED TO ILLUMINATE IS SUFFICIENT PRESSURE FOR EFFECTIVE PNEUMATIC DEICE BOOT OPERATION. A COPY OF AC 23.1419-2A WAS PROVIDED TO THE BOARD ON 12/11/98. ON 12/11/98, THE FAA ALSO INFORMED THE BOARD THAT IT WOULD INCORPORATE APPROPRIATE INFORMATION ON 14 CFR PART 25 AIRPLANES IN AC 25.1419-1, CERTIFICATION OF TRANSPORT CATEGORY AIRPLANES FOR FLIGHT IN ICING CONDITIONS, IN LIEU OF REVISING AC 20-73. ON 3/1/99, THE BOARD AGREED WITH THIS ACTION AND CLASSIFIED THIS RECOMMENDATION AS "OPEN ACCEPTABLE ALTERNATE ALTERNATE RESPONSE" PENDING ISSUANCE OF AC 25.1419-1. ON 8/18/99, THE FAA ISSUED AC 25.1419-1, WHICH INCLUDES GUIDANCE TO ENSURE THAT THE PNEUMATIC PRESSURE THRESHOLD AT WHICH EACH DEICE BOOT INDICATION LIGHT IS DESIGNED TO ILLUMINATE IS SUFFICIENT PRESSURE FOR EFFECTIVE PNEUMATIC DEICE BOOT OPERATION. I HAVE ENCLOSED A COPY OF AC 25.1419-1 FOR THE BOARD'S INFORMATION. I BELIEVE THAT THE ISSUANCE OF AC 25.1419-1 COMPLETES THE FAA'S ACTION IN RESPONSE TO THIS RECOMMENDATION, AND I PLAN NO FURTHER ACTION.
Response: A-91-90 ASKED THE FAA TO REVISE AC 20-73, "AIRCRAFT ICE PROTECTION," AND AC 23.1419-1, "CERTIFICATION OF SMALL AIRPLANES FOR FLIGHT IN ICING CONDITIONS," TO INCLUDE GUIDANCE FOR THE FULFILLMENT OF 14 CFR PARTS 23.1416 (C) AND 25.1416(C) BY ENSURING THAT THE PNEUMATIC PRESSURE THRESHOLD AT WHICH EACH DEICE BOOT INDICATION LIGHT IS DESIGNED TO ILLUMINATE IS SUFFICIENT PRESSURE FOR EFFECTIVE PNEUMATIC DEICE BOOT OPERATION. THE FAA'S ACTION TO INCORPORATE IMPROVEMENTS TO THE ICING CERTIFICATION TESTING PROCESS BY REVISING ITS GUIDANCE MATERIAL IS A POSITIVE STEP IN CLARIFYING THIS IMPORTANT AREA OF THE CERTIFICATION PROCESS. PENDING FINAL ISSUANCE OF AC 25.1419-1X, A-91-90 IS CLASSIFIED "OPEN--ACCEPTABLE ALTERNATE RESPONSE."
Response: Letter Mail Controlled 02/19/1999 10:03:45 AM MC# 981470 ON 8/19/98, THE FAA PUBLISHED AC 23.1419-2A, CERTIFICATION OF SMALL AIRPLANES FOR FLIGHT IN ICING CONDITIONS. THE AC INCLUDES GUIDANCE TO ENSURE THAT THE PNEUMATIC PRESSURE THRESHOLD AT WHICH EACH DE-ICE BOOT INDICATION LIGHT IS DESIGNED TO ILLUMINATE IS SUFFICIENT PRESSURE FOR EFFECTIVE PNEUMATIC DE-ICE BOOT OPERATION. I HAVE ENCLOSED A COPY OF AC 23.1419-2A FOR THE BOARD'S INFORMATION. IN LIEU OF REVISING AC 20-73, THE FAA INCORPORATED APPROPRIATE INFORMATION ON 14 CFR PART 25 AIRPLANES IN DRAFT AC 25.1419-1X, CERTIFICATION OF TRANSPORT CATEGORY AIRPLANES FOR FLIGHT IN ICING CONDITIONS. A NOTICE ANNOUNCING PROPOSED AC 25.1419-1X WAS PUBLISHED IN THE FEDERAL REGISTER ON 10/5/98. THE COMMENT PERIOD ENDS 12/4/98. I HAVE ENCLOSED A COPY OF THE APPLICABLE INFORMATION IN THE AC THAT ADDRESSES THIS SUBJECT.
Response: THE BOARD NOTES THAT THE FAA PLANS TO REVIEW APPENDIX C OF 14 CFR PART 25, REVISE ACS 25-7 & 23.1419, & DEVELOP A NEW AC 25-1419 TO ADDRESS THE CERTIFICATION OF 14 CFR PART 25 AIRPLANES FOR FLIGHT IN ICING CONDITIONS. THE BOARD ALSO NOTES THAT THE FAA AGREED, IN A 1/31/92, LETTER, THAT ADVISORY MATERIALS FOR USE IN FINDING COMPLIANCE WITH THE ICING REQUIREMENTS OF 14 CFR PARTS 23 & 25 SHOULD INCLUDE GUIDANCE MATERIAL TO ENSURE THAT THE PNEUMATIC PRESSURE THRESHOLD AT WHICH EACH DEICE BOOT INDICATION LIGHT SHOULD ILLUMINATE IS SUFFICIENT FOR EFFECTIVE PNEUMATIC DEICE BOOT OPERATION. PENDING THE COMPLETION OF THE FAA'S REVISIONS TO THE ACS, A-91-90 IS CLASSIFIED "OPEN--ACCEPTABLE RESPONSE."
Response: THE BOARD NOTES THAT THE FAA PLANS TO REVIEW APPENDIX C OF 14 CFR PART 25, REVISIONS TO AC'S 25-7 & 23.1419, & THE DEVELOPMENT OF A NEW AC 25.1419 WHICH WILL ADDRESS THE CERTIFICATION OF 14 CFR PART 25 AIRPLANES FOR FLIGHT IN ICING CONDITIONS.
Response: THE FAA AGREES THAT GUIDANCE MATERIAL RELATED TO THIS REQUIREMENT SHOULD BE INCLUDED IN ADVISORY MATERIALS FOR USE IN FINDING COMPLIANCE WITH THE ICING REQUIREMENTS OF 14 CFR PARTS 23 AND 25. THE FAA WILL PUBLISH ADVISORY MATERIAL TO PROVIDE CRITERIA FOR CERTIFICATION OF THE CAUTION ASSOCIATED WITH ABNORMAL FUNCTIONING OF THE ANTI-ICE OR DEICE BOOT SYSTEMS.