A-69-024
NTSB Safety Recommendation — Aviation
Recommendation text
BOARD RECOMMENDED SEPARATION OF "KNOWN" AND "UNKNOWN" TRAFFIC OPERATIONS TO THE BROADEST EXTENT PRACTICABLE BE ACHIEVED. CONSIDERATION BE GIVEN TO THE DESIGNATION OF LARGER SEGMENTS OF THE NAVIGABLE AIRSPACE AS POSITIVE CONTROL AREAS TO INCLUDE TERMINAL AREAS. REGARDING MILWAUKEE TERMINAL, THE MIX OF KNOWN AND UNKNOWN TRAFFIC BE REDUCED BY RESTRUCTURING VICTOR AIRWAY 479. ALL USERS OF AIRSPACE MAKE EVERY EFFORT TO ACHIEVE THE MAXIMUM BENEFIT FROM VISUAL DETECTION PARTICULARLY IN TERMINAL AREAS WHERE THERE IS APT TO BE A MIXTURE OF LARGE HIGH-SPEED AIRCRAFT AND SMALL RELATIVELY LOW-SPEED AIRCRAFT. WHEN TRAFFIC ADVISORIES ARE RECEIVED, BOTH PILOTS OF EACH AIR CARRIER AIRCRAFT COORDINATE THEIR EFFORTS TO ASSURE THAT THE DESIGNATED AREAS ARE THOROUGHLY SCANNED. AIR CARRIERS EMPHASIZE, BOTH DURING TRAINING AND OPERATIONS, THE ENTIRE SPECTRUM OF SITUATIONS IN WHICH THE USE OF AN AVOIDANCE VECTOR WOULD BE ADVISABLE. INSPECTION FORMS INCLUDE A WINDSHIELD CLEANING REQUIREMENT AT ALL MAINTENANCE STATIONS AS WELL AS A MANDATORY CLEANING AND SIGN-OFF OF ANY DIRTY WINDSHIELD COMPLAINT MADE BY A FLIGHT CREW. STUDIES BE CONDUCTED TOWARDS DEVELOPMENT OF IN-FLIGHT MEASURES TO CLEAN WINDSHIELDS BY DEFLECTING AIRFLOW, WINDOW WASHING OR USE OF CHEMICAL REPELLENTS. BOARD URGES EARLY DEVELOPMENT OF A LOW COST AIRBORNE COLLISION AVOIDANCE EQUIPMENT, FOR USE OF ALL TYPES OF AIRCRAFT, TO SUPPLEMENT THE SERVICE PROVIDED BY THE AIR TRAFFIC CONTROL SYSTEM.
In plain language (FlightFinder summary)
The NTSB urges the FAA to separate known and unknown air traffic as much as possible, including redesigning specific flight paths in Milwaukee to reduce mixing. The agency should also encourage pilots to visually scan for other aircraft and ensure windshields are kept clean to aid visibility. Additionally, the recommendation calls for developing affordable onboard collision avoidance systems to supplement existing air traffic control services.
This plain-language summary is written by FlightFinder to explain the recommendation above. It is not the official wording — the verbatim NTSB text is quoted above.
Details
| Status | Closed - Acceptable Action |
|---|---|
| Mode | Aviation |
| Closed | Jul 31, 1970 |
| NTSB number | DCA69A0001 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).