Tuesday, November 15, 2005

Approach Plate Effective Dates

Before a pilot descends through clouds or poor visibility in search of an airport, she reviews, with herself or her co-pilot, the procedure she will use. That procedure is very specific, including minimum altitudes, tracks, directions of turn and so forth, and it is published on a document known as an approach plate. The approach plate is about 15 cm by 23 cm and comes in a spiral bound booklet between 8 and 20 mm in thickness, depending on whether you're looking at CAP1, the booklet for Nunavut or CAP4 for Ontario. We just call the booklet "the CAP."

In Canada, the CAP is republished every 56 days, but the approach for a particular airport may not change substantially in years. Usually the plate doesn't change at all from update to update, and when it does it is usually no more than a litle note somewhere, a comma, or a couple of feet of altitude here or there.

It's still important to verify that the plate is up to date, so the pilot confirms the effective date, at the bottom left corner of the plate. I've never been very impressed with this as a check, because it's not an expiry date: it's the date the plate was last revised and released for use. The entire book of plates has both an effective date and an expiry date printed on the cover, but the plate itself has only an effective date. I don't believe you would ever see an effective date on a plate that was after the effective date on the cover of the booklet. The publishers might know an approach would change as of a particular date that was in between issues of the CAP, but in that case they would issue the change as a NOTAM. I have a couple of plates in my current CAP that have handwritten amendments because of current NOTAMs.

They can't print an expiry date on the plate itself, because they don't know when the plate will be amended next. I suppose they don't print the effective date of the entire CAP on each plate, because then they would have to change each plate every issue. The American plates do have the effective date of the entire booklet (I don't know the slang name for their booklet) printed on each plate, so they may have a different printing system. The US goverenment plates also display an amendment number, such as Amdt 19B and another number that isn't explained but that appears to start with the last two digits of the year the plate was amended. Most Americans don't use these government issue approach plates: they pay more for plates from Jeppeson, a private publisher. I don't have any Jepps with me right now, and I can't remember the system they use.

You might think that the dates on the cover would suffice to identify the plates within, but the problem is that the book isn't especially useable in flight. The plates are printed both sides, and it's difficult to flip through to find the plates you want while flying. So we tear the pages out, or photocopy them, or tear the pages out of the previous expired book after verifying that the effective dates haven't changed, and that way we can have the plates for our current trip stacked up in the order we expect to need them. And there's no firm check that the effective date on the plate in my holder matches the one in the new CAP tucked away behind the seat.

My company forbids photocopies of plates, but most people do it anyway, because it works much better when you're flying. Every time a new CAP comes out, I check for revised ones, and if I'm pulling out previously made photocopies for a trip, I check them against the current CAP, but still it's a risk. Does anyone have a system that keeps the approach plates organized and accessible, yet provides positive confirmation that the plate in your holder is the current one?


Anonymous said...

If you have some (photocopied) plates you use often (e.g. RCAP plates), the following works well: You can purchase from Jeppsen this little binder with plastic sleeves that are just the right size for the plates. Actually, you can probably find cheap knockoffs of the binder; I think the Jepp plates have 7 holes, and you can just buy the sheet refills on their own if you look for them. This way you don't even have to used double sided photocopies (if you are using them that is); just stuff two plates back to back in the sheet holder. You can also just use the clear sheets on their own and use one of those ring-clip things (like used in binders, only on their own - I forget the proper name) to hold them together.

If you have money and time to waste, you can laminate the copies and secure them somehow, but I'm too lazy and cheap for that.

As for potential expiry date, I just jot it down in pencil at the top. If it is still good come "expiry" time, erase the date and write in the next date you might have to switch them.

Lord Hutton said...

Wont they buy you a compluter?

david said...

I actually find the CAP pretty usable in flight with its spiral binding, high-quality paper, and clear printing. I like the US NOAA plates much less, with their cheap, smudged newsprint and glue binding (which prevents them from lying open properly).

For the CAP, I buy those little post-it-style bookmark tabs from 3M (the ones with different colours) and stick them to the plates I plan to use before a flight. One for each airport is enough -- it's not hard to flip back or forth a couple of pages -- and I find the system pretty usable in a crowded cockpit. I used to photocopy plates as well (it's what my instructor taught me), but I find that that gets difficult to manage, and I don't like to have to share my kneeboard with plates as well as flight log, hobbs sheet, copies of ATC clearances, altimeter, ATIS, etc. etc. I keep all my charts and plates in a little rectangular nylon suitcase that slides under my seat, so that I can reach down and fish things out as needed.

Anoynmous said...

Computer displays (e.g. Advanced Data Research's Electronic Flight Bag) are one way to make sure you don't have obsolete charts hanging around.

If you don't mind generating extra waste paper, JeppView software can be used to print out the most current approach plates before each flight.

aasmodeus said...

instead of pencil, why not combine those ideas. use a dry-erase marker with the plastic sleeves (or laminated plates). write-on, wipe-off, easy to read, and protected.

John said...

Where on earth did you get the idea that most U.S. pilots use Jepp charts? Jepp charts are nice, but the government-issued approach charts have undergone many improvements in recent years.

Government charts are cheaper than Jepp and when it comes to updates, you just throw out the old book and buy a new one for about $6US.