amended clearance

A clearance issued by air traffic control amending a previous ATC (air traffic control) clearance in response to a request from the pilot or initiated by air traffic control to avoid conflict with other aircraft or severe weather.

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Among the various thoughts that run through our minds--"How long will this delay me?" or, "What did I do to anger this controller?"--we may also wonder exactly why we're getting an amended clearance.

IFR Route Changes: We can't always go direct. Avoid in-flight IFR route changes by paying attention to preferred and TEC routes during your preflight planning

"Approach, N123AB is missing off the RNAV 36, circle 27." ATC should remember they need to provide an amended clearance. If not, just ask, "Request missed approach guidance."

CIRCLING UNCERTAINTY: Missing from a circling approach can leave you in limbo, but ATC and the AIM can help get you back on track to a safe missed approach

AIM 4-4-10 says, "When air traffic clearance has been obtained under either visual or instrument flight rules, the pilot-in-command of the aircraft must not deviate from the provisions thereof unless an amended clearance is obtained.

SITTING IN LIMBO: If something is amiss with your clearance--and you know it--it's your responsibility to speak up, even if it's ultimately an oversight or mistake by ATC

FAR 91.123 tells us pilots are permitted to deviate from an ATC clearance when "an amended clearance is obtained, an emergency exists, or the deviation is in response to a traffic alert and collision avoidance system resolution advisory." Deviation around storms (or vertical clouds) does not constitute an emergency, nor (of course) is it the result of a collision warning.

Sidestepping Storms: Coordinate your plan with ATC, stay in VMC and don't get too close

Remember, I've already given the Cirrus his amended clearance. I note that he's begun his turn to the new next fix.

Behind the scenes: all pilot requests are important. Some are just more time-critical and can demand some off-camera teamwork

Amended Clearance: Among the six words most dreaded in the IFR cockpit are "stand by to copy amended clearance." That means your best-laid plans are out and ATC's new plans are in.

Avoiding cockpit distractions: start by turning off the cellphone and keeping a sterile cockpit at high-workload times. Remember: no matter what goes wrong someone has to fly the airplane

While south bound and casually monitoring the center, I picked up the tail end of an amended clearance, "...

On the air

Better yet, include the T-route entry and exit fixes in your flight plan, so you won't have to scramble to load it into your GPS when given an amended clearance in flight.

IFR GPS: good, bad or just ugly? In a few short years, GPS revolutionized light-plane IFR. Along with the added capability can come higher workload, though, along with greater complexity

In response to "Filing for a Lat/Long" in January 2012 edition of IFR: Would it not be simpler to use the OBS mode of the Garmin GNS530W to fly the PMM radial in the amended clearance?

Another way to go

You're flying the amended clearance you received on the ground at LVK and are just past the Manteca VOR when your headset falls apart.

Direct to nowhere: in our dynamic ATC system, pilots and controllers have to be on their toes to ensure everyone is working from the same page

FAR 91.123(a) says: "When an ATC clearance has been obtained, no pilot in command may deviate from that clearance unless an amended clearance is obtained, an emergency exists, or the deviation is in response to a TCAS resolution advisory ..."

You're so busted: you messed up and didn't comply with ATC. Will the FAA come knocking on your door? That depends on what you did and how you handle it

You might request an amended clearance to some higher altitude, or you might have to contend with a new route, which you're expected to be able to copy and read back, all while you're still climbing in the soup.

IFR rules, VFR Tools: when the weather's good, IFR pilots have a lot more flexibility than when it's too foggy to drive to the airport. Know what they are and when you can use them

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