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and filed clearances. As a result, flight crews often believe that revisions
are erroneous (or separate clearances), and revert to their original
filed clearances. A recent report from a flight crew illustrates:
“After checking in, the Center told us to proceed direct to ‘ATL,' rest of route
unchanged. A quick check of our route showed we were not going over ATL
so we told Atlanta Center we were not filed that way. He asked how we
were filed and then changed our clearance to ‘ATL-VUZ-as previously
cleared.' The confusion I [felt] resulted from the display on our ACARS
screen:
– HARAY SPA J14 ATL VUZ –
CLT HARAY ODF VUZ J52 DFW
J4 ABI J66 EWM J4 ./. SAN
SQK 2021 ALT 310
…I assumed the – HARAY SPA J14 ATL VUZ – part was a mistake, since it
was not complete.” (# 313340)
Sample PDC Formats
An ASRS analyst team obtained
samples of actual PDC formats
used by air carriers. Excerpts
from several of these clearances
are depicted below. Following
each clearance is an explanation
of the formatting inconsistency
identified by ASRS.
SAMPLE 1
##DPTR CLRNC##
FLT 1234-05 SEA - SFO
XAL1234 SEA
T/B73J/G P2150 RQ330
XPDR 3572 EDCT 2200
SEATTLE2 RV J70
ELMAA
MAINT 9000 EXPT REQ
ALT 15NM AFT T/O
CONTACT DPTR CTL ON
120.4
CLNC VOID 15 MIN
AFTER EDCT
SEA ELMAA5 CVO
J589./. SFO
Problem: This PDC cites two
departures, SEATTLE2 and
ELMAA5. The flight crew must
sort out which departure to use.
22 ASRS Operational Issues Bulletin 96-01
Sample PDC Formats
SAMPLE 2
_HX PDC MESSAGE
PDC 25 XAL1234 2602 PHX
T/B72S/G P1616 455 200
–DRK6 DRK J92 BLD–
PHX DRK6 DRK J92./. SFO
EDCT 1818
Problem: There is no apparent
difference between the revision
–DRK 6 J92 BLD–
and the filed clearance. This is
potentially confusing to a flight
crew.
SAMPLE 3
_EA PDC MESSAGE
PDC 10 XAL1234 3516 SEA
T/B72S/G P1455 872 330
–ELMAA5 CVO–
SEA J70 ELMAA J589./.
EDCT
ELMAA5.CVO DEPARTURE
Problem: The revision is between
dashes:
–ELMAA5 CVO–.
ELMAA (the same routing) is
repeated on the next line for no
apparent reason.
The type of confusion experienced by this flight crew over their PDC
routing is potentially hazardous, as noted by a controller reporter to
ASRS:
“It has been my experience…that several times per shift aircraft which have
received PDCs with amended routings, have not picked up the
amendment…I have myself on numerous occasions had to have those aircraft
make some very big turns to achieve separation.” (# 233622)
The sources consulted by ASRS suggested several potential solutions to
this problem:
4 Standardize PDC formats, so that pilots will know where to look for
routing information and revisions.
4 Show only one clearance line in a PDC, and insert any revisions into
the clearance line. For example, instead of showing a route revision
this way:
– SFO 6 SFO LIN J84 MVA J198 ILC –
SFO LIN OAL J80 ./. BWI
Show it this way:
– SFO 6 LIN J84 MVA J198 J80 ./. BWI
4 Make the revision section more visible by tagging it (“REVISION”) or
highlighting with asterisks or other eye-catching notation (*****).
4 Provide flight crews with training in how to recognize PDC revisions.
Assigned SIDs. Another source of confusion occurs when assigned Standard
Instrument Departures (SID) information is placed outside the routing
section of the PDC. An ASRS report explains:
“We were anticipating radar vectors to intercept J70 ELMAA, etc., which
was the route listed on the PDC message against our flight plan. Seattle Departure
questioned us if we were in the turn. We replied negative, we were
runway heading expecting vectors. We referred again to the PDC with route
J70 ELMAA, with no mention of any SID. Departure then questioned which
SID we were assigned. Again referring [to] the PDC, we noticed that the
ELMAA 5 departure was listed. However, it was printed on the top portion
of the PDC message, not near the route lines which are always on the bottom
portion of the message…The placement of the SID in the portion of the
PDC reserved for remarks caused both pilots to believe no SID was assigned.”
(# 229216)
This pilot and other ASRS reporters had a single recommendation for how
to handle SID information in PDCs:
4 Standardize the placement of SID information within the PDC.
　
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