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rechecked the door to ensure it was properly closed; it was
also checked from the exterior by ground personnel. After
takeoff, we examined the MEL, and discovered that the
door light was not a crew-placard item.
Another First Officer also learned too late the importance
of consulting the MEL before take-off.
n Inbound equipment arrived late. About 5 minutes
before pushback time, I discovered that my right armrest
was stuck in the UP position. I attempted to free it, but
no luck. I contacted maintenance and asked them to
bring something to lubricate the mechanism. A mechanic
did so, but to no avail. We figured we could just go with
it in the UP position. It did not occur to us to look it up
in the MEL, as it did not seem to be a safety-of-flight
item.
Upon our arrival, we were told that the armrest is a no-go
item. The continuing flight was cancelled due to this
fact, since no spare seat or replacement part was
immediately available. The Captain and I were both
amazed that something as simple and innocuous as an
armrest would be considered a no-go item. In the future,
I will check the MEL for any item, no matter how
seemingly insignificant.
Confused, Bothered and Bewildered (By MELs)
Number 217 July 1997
A Monthly Safety Bulletin
from
The Office of the NASA
Aviation Safety Reporting
System,
P.O. Box 189,
Moffett Field, CA
94035-0189
May 1997 Report Intake
Air Carrier Pilots 1798
General Aviation Pilots 701
Controllers 69
Cabin/Mechanics/Military/Other 38
TOTAL 2606
ASRS Recently Issued Alerts On...
Engine failures in an MD-80 and an MD-88
http://olias.arc.nasa.gov/asrs
Many hand-held GPS units have an inherent system
limitation, as our next reporter discovered.
n Flying VFR, using a hand-held GPS for navigational
reference. While en route, position and status seemed fine.
According to the GPS position, a “big airport” was getting
closer and closer, but still out of the overlying Class C
airspace. From a visual standpoint, the position was
definitely in Class C airspace. When I landed at ABC, the
GPS indicated the location was XYZ [about 40 nm west].
I turned the unit off, then back on, and the position now
indicated ABC.
I called the manufacturer, which had received numerous
calls about erroneous positions. A new satellite had been
Parachute jumping activity near a Nevada arrival route
Erroneous computerized groundspeeds at a Utah Center
BAe-31 engine reversal due to propeller governor failure
Autopilot and elevator trim malfunctions on a Beech King Air
Going Global with GPS
As the cost of Global Positioning System (GPS) units
decreases, more pilots are using these devices to
supplement their other navigational equipment.
However, problems can arise when some pilots fail to
recognize that GPS is designed to be a supplemental—not
a primary—navigational aid. A report from a corporate
pilot illustrates:
n I departed on an IFR flight plan with an IFR-approved
GPS. I was cleared direct to ABC, at which time I dialed
ABC into the VOR portion of the GPS and punched
“direct.” The heading was 040 degrees. After a few
minutes, Approach inquired as to my routing, heading,
etc. I stated direct ABC, 040 degrees. They suggested
turning to 340 degrees for ABC. I was dumbfounded.
My GPS receiver had locked to ADC, 3,500 miles away
[in Norway]! Closer inspection revealed that my
estimated time en route was 21 hours.
I did not verify my position with the VOR receiver. I
mistakenly, blindly, trusted a GPS.
Now that is truly global positioning!
Other reporters have found themselves somewhere other
than where they wanted to be as a result of overreliance
on GPS. A general aviation pilot provides an example:
n I recently purchased a hand-held GPS, and was
anxious to use my new acquisition. Without thinking
(obviously!), I punched in XYZ VOR and navigated along
the direct route. I did not cross-check myself with the
VORs and allowed myself to invade restricted airspace.
I tuned in 121.5, and received instructions and polite
guidance out of my dilemma. I realize that this is a
serious problem and a very stupid mistake.
When properly programmed and used, GPS has incredibly
accurate position reporting capability, which can prove to
be a lifesaver—literally. The next reporter, the pilot of a
long-range amphibious airplane on a ferry flight across the
Pacific Ocean, tells a “GPS-to-the-rescue” story.
n While we were ferrying the aircraft…the left engine
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