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Confusion in Using
Pre-Departure Clearances
ASRS Operational Issues Bulletin 96-01 23
Confusion in Using
Pre-Departure Clearances
Lack of Confirmation Procedures For PDC Receipt
Another frequently reported problem is flight crews’ forgetting to obtain
PDC, and taking off without a clearance. This oversight occurs primarily
at airports that do not have a confirmation procedure for PDC receipt by
the flight crew. The first clue that the PDC has been forgotten usually is
when the Departure controller gives the crew a transponder code and Departure
frequency, as described by these ASRS reporters:
“Our company uses PDCs to retrieve ATC clearances on ACARS. I requested
our clearance but it didn’t come up. I left the aircraft for a couple of minutes
and when I returned, I failed to request the clearance a second time.
We completed all checklists and departed, still failing to realize we hadn’t
received the clearance. On climbout, we received the Departure frequency
from the Tower. Departure gave us the correct squawk code. Since we had a
copy of the company routing and were accustomed to using the Hornet SID,
we were lucky we ended up doing what we were supposed to do. I was surprised
that none of the controllers seemed aware that we didn’t have the
text of the clearance…On our [Before Start] checklist there is an item, ‘Radio/
ACARS.’ That was our only opportunity to prevent this error, but neither
of us looked up the Departure frequency or squawk code…Pilots need to
cross-check themselves with some sort of reminder.” (# 250847 & 250495)
ASRS sources had several suggestions for combatting the “forgotten PDC”
problem:
4 ATC facilities at PDC airports should consider requiring flight crews
to read back their transponder codes prior to taxi.
4 Flight crews should consider adopting the personal verbal challenge,
“Code/Mode,” at engine start. In glass cockpit aircraft, this is a reminder
to check the transponder code and the navigation control
mode. In non-glass cockpit airport, “Code/Mode” is a reminder to
check the transponder setting.
Sample PDC Formats
SAMPLE 4
A recent letter to ASRS from an
air carrier pilot noted another
type of PDC discrepancy. This
pilot is involved with daily
flights from Los Angeles and
San Francisco to Vancouver
(CYVR), British Columbia. The
final flight segment is SEA DRCT
PAE DRCT ACORD ACORD6
CYVR. The PDC duplicates the
filed flight plan up to Seattle,
but then truncates the rest of
the clearance as shown:
PDC 173 FLT XAL1234/12
KSFO
T/DC9/A P2110 BQ350
XPRD 1720 EDCT 1310
–SF06 SFO RBL–
KSFO RBL J65
SEA***CYVR
Problem: Because of the truncated
PDC routing, the flight
crew must call Clearance
Delivery before takeoff to verify
the actual route after SEA. The
discrepancy between the filed
and PDC routes creates confusion
for the flight crew. The
necessity to call Clearance
Delivery also nullifies the
advantage of using a PDC. _
24 ASRS Operational Issues Bulletin 96-01
Summary of PDC Recommendations
4 Standardize PDC formats, including placement of SID information, 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.
4 Make PDC revisions more visible by labeling them (“REVISION”) or
highlighting with asterisks or other eye-catching notation (*****).
4 Include PDC formats and interpretation in pilots' recurrent training.
4 Standardize confirmation procedures for PDC receipt. At airports
using PDCs, ATC facilities should consider requiring flight crews to
read back their PDC transponder codes prior to taxi.
4 Flight crews should consider adopting the personal verbal challenge,
“Code/Mode,” at engine start. _
Users Note: The information presented in this bulletin is subject to some of the known limitations
of ASRS data:
(1) incidents cannot be independently verified; (2) reporters to ASRS may have a variety of reporting
motivations and biases; (3) the voluntary and non-random nature of ASRS report submissions
makes it impossible to accurately assess the full population of events for a given
incident type. In spite of these limitations, ASRS report processing analysts have a unique vantage
point in monitoring aviation system issues and problems from the incoming report flow of
approximately 2,600 reports each month.
ASRS Contacts. Comments and questions related to this bulletin may be directed to Ed Arri and
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