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verified and the flight continued without incident. The mix-up
was also not noticed by the other crew. Therefore, the error
went undetected by the original agent and four crew members.”
(ACN 192294)
Wrong Leg
Pilots of flights with multiple legs face another potential
problem:
✍ “Our flight (BOS-PWM) received the wrong departure
(PDC) clearance in BOS. It had the proper flight number and
date, but was the PDC for the ATL-BOS leg. When transponder
code was reported wrongly off the PDC, they only said,
‘change squawk to read xxxx,’ thus not alerting the crew to the
error. After takeoff, crew found out altitude cleared to was
wrong also, but did not violate any altitudes. Coordinated
with…ATC, company flight control and…operations to find
error causes and correct.” (ACN 179596)
by Charles Drew
New solutions to old problems sometimes result in a few new problems.
Such is the case with Pre-Departure Clearances (PDC’s). Getting an IFR route
clearance has often been difficult during busy times at major airports, with pilots
competing on a congested clearance delivery frequency, and controllers having to
read involved, often lengthy instructions. Solution: PDC’s.
With a pre-departure clearance, the flight crew
of a cooperating air carrier can get their IFR
clearance from their company rather than
directly from an ATC facility. ATC still issues
the clearance, of course, but the transfer of
information is directly to the air carrier’s dispatch
department via teletype, computer link,
or other method, rather than by voice communication
on an ATC frequency. The air carrier
then provides the clearance to the flight crew
in the form of a printed message, or via ACARS.
But, there have been a few problems.
Don’t Leave Home Without It
Some flight crews have departed without an IFR
route clearance:
✍ “After takeoff, I switched to Departure
Control as instructed. When I got no response
I tried to verify the frequency by
retrieving the clearance from ACARS…When
I saw there was no PDC message stored I
asked my First Officer for the correct frequency
from his verbal PDC and he said,
eventually, ‘Oh-oh, I forgot to get our clearance.’
” (ACN 198736)
And from another reporter:
✍ “Shortly after takeoff, ATC told us to
change transponder code. We complied, then
checked pre-departure clearance (PDC) for
assigned squawk. Couldn’t find paper, even
though all other paperwork was located. We
either lost the PDC or never received it.”
(ACN 208027)
Issue Number 5 5
Wrong Day
It’s even possible to get a PDC for the correct
flight number, but the wrong day:
✍ “I picked up our pre-departure clearance
at the counter in the terminal area about 15
minutes before departure…I reviewed the
clearance as I fought my way through the
packed jetway to the cockpit. As I entered my
seat and began to review the departure and
planned route of flight, the APU shut down
on its own. There was no external power
plugged in and no ground personnel in sight.
I let the F/O continue cockpit setup and went
in to operations to get ground power hooked
up and a mechanic to look at the APU. When
I got back to the cockpit, we ran the predeparture
checklist, started engines, and
taxied for takeoff. …after takeoff when Tower
cleared us to Bay Departure Control with a
turn to 030 degree heading, we questioned
which departure we were assigned. Tower
impatiently informed us we were on the San
Francisco 6 which we then complied with.
Later, reviewing our pre-departure clearance,
I found the problem was [that] the predeparture
clearance I was given was for March/
Sunday, not March/Monday…There’s no excuse
for my missing the date on the pre-departure
clearance, but I thought this was another
example of how a series of events can lead to
a hazardous situation.” [Emphasis added.]
(ACN 236984)
Changes Not Noted
Another of the problems noted in PDC incidents
is that flight crews fail to note changes on the
PDC to their filed or “usual” route:
✍ “Climbing out of SLC enroute to LAX.
ATC cleared us direct to FFU, flight plan
route. After passing FFU and proceeding on
what we thought was our flight plan route,
ATC asked us what our routing was. We
doubled checked our PDC and realized we
had misread the clearance.” (ACN 218473)
　
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