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• Commuter and GA Icing Incidents
• Controlled Flight Toward Terrain
• CRM Issues
• Fuel Management Issues
• Inflight Weather Encounters
• Land and Hold Short Operations
• Mechanic Reports
• Multi-Engine Turbojet Aircraft
Upsets Incidents
• Non-Tower Airport Incidents
• Parachutist / Aircraft Conflicts
• Passenger Electronic Devices
• Pilot / Controller
Communications
• Rotary Wing Aircraft Flight Crew
Reports
• Runway Incursions
• TCAS II Incidents
• Wake Turbulence Encounters
Issue Number 10 25
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Dec-95 Figure 1—ASRS Web Site “
Hits” and “
User Sessions,” December, 1995 through September, 1998
m 435,720 Directory “Hits”
m 154,835 “User Sessions”
5,000
10,000
15,000
20,000
25,000
30,000
Web Site Usage—Some Interesting Numbers
ASRS Publications
HTML and PDF versions of CALLBACK and ASRS Directline complement the printed versions of these publications.
CALLBACK, posted monthly to the Web Site, is extremely popular—an average of 1,200 users every
month read the most current “online” version.
NASA Aviation Incident Reporting Forms
In April of 1997, ASRS introduced Adobe Acrobat versions of the Reporting Forms. (Users download a PDF
version of the Reporting Form of their choice, a free copy of Adobe Acrobat Reader, and then print, fill out
and mail their completed report.) Here are the downloads for NASA Reporting Forms:
• General (Pilot) Forms ............................ 9,560
• Maintenance (Mechanic) Forms ........... 2,417
• Cabin Crew Forms ................................. 1,566
• ATC (Controller) Forms ......................... 1,345
Total ..................................................... 14,888
Overall Access to the ASRS Web Site
Figure 1 (below) shows both "Hits" and "User Sessions" from December, 1995 though September, 1998. (See
the “Definitions” sidebar on page 23 for an explanation of “Hits” and “User Sessions.”)
ASRS Database Reports Sets
Rich Text Format versions of frequently search requests were introduced in January of 1998. As can be seen
in Table 1 (facing page), these have generated a lot of interest. _
26 Issue Number 10

ASRS
Directline
Fall 1991
■ International Altimetry
■ One Zero Ways to Bust an Altitude
■ What Goes UP…Must Come DOWN
■ Between a Rock and a Hard Place
■ Last Leg Syndrome
The Aviation Safety Reporting System
is a cooperative program established by the
Federal Aviation Administration’s
Office of The Assistant Administrator for Aviation Safety,
and administered by the
National Aeronautics and Space Administration.

ASRS Directline Fall
1991
Welcome to ASRS Directline, a quarterly safety digest by the analysts of NASA’s Aviation Safety
Reporting System. Our inaugural issue (Spring 1991) was well received, and with this issue we begin
regular quarterly publication. Directline is intended to meet the needs of operators and flight crews of
complex aircraft, and of ATC personnel who are looking for insight into more effective interaction with
these operators. As with most safety information, we believe those in general aviation will find that
Directline’s information is applicable and beneficial to their operations as well.
Articles contained in Directline are based on ASRS reports containing issues that have been
identified as significant by ASRS analysts. Distribution is directed to managers and management
personnel, safety officers, and training and publications departments. Because our job and our
interest is aviation safety, we encourage editorial use, reproduction, and distribution of Directline
articles—we merely ask that you give credit to the ASRS and to the authors.
Here are the articles in this second issue of ASRS Directline.
International Altimetry(Perry Thomas) ............................................................................... Page 4
Some types of aviation problems are identified as significant because of the sheer volume of
　
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