CO55
 

Hey guys I am just studying some things as next month Ill be finally able to join the elite group of poor whiney pilots living the dream... Not sure what forum to post this on but question on CO55 as I have no prior 121 background. The OpSpecs allow for us to use something different than what is on the taxi/alt mins Jep plates, is that correct? I understand the Ops Spec rule about how to classify the airport under the Ops Spec, but I just am unsure which supersedes the other or how to determine that I am legal to list it as an alternate. Thanks guys.

If the runway or airport is listed as "Alternate: NA," you still can't use it. Other than that, C055 is used as an alternate weather minima filing requirements. Instead of using 800-2 or 600-2 as per FAR 91, you use 400-1 or 200-1/2.

Well you're wrong on the rules you just gave me because thats not what the Ops Spec says. But lets say the plate says "800-2" for an alternate onto an ILS, if I used CO55 that would allow me to go below those listed mins. I only can't use CO55 when it says "NA" on the approach I want to do. Is that accurate?

Just to further clarify, you ADD the 400-1 to the MDA/DA and visibility of the 1 nav method. For the 2 nav method you ADD 200 1/2 to the HIGHER of the MDA/DA and the HIGHER visibility of the two published mins of different runways. You cannot use a GPS approach for the 1 nav method if the destination airport is GPS approach dependent also.

The FOM determines what the company can/cannot do for minimums. OpSpec 55 brings the minimums down to a lower amount than 91/121 regs. The FAA signs off on this and the FOM is controlling.

If you had your 800-2 scenario the minimums using Ospec 55 would be ILS rwy X minimums + 400 & 1 mile.

It would help if you said which plate you were talking about.

Yes. That's correct. I should've put add but was just trying to make it as short and sweet as possible. I should have been more clear. Thanks for clarifying.

Alright lets say you've listed IAH as your alternate and you're planning ILS 8L, the plate says its 600-2 for an alternate, but because there are two possible approaches, using CO55 you could list it as your alternate IF the weather at the ETA was: 7/8 mile vis and 400 OVC. Correct?

That depends on what TSO your avionics fall under and will be listed in your Ops Spec. Some can't use a GPS approach for either, some can only use it for the destination or the alternate, and some can use a GPS approach for both.

If there are two ils both 200 and 1/2. You add 200 and 1/2 to the approach.

Don't even look at alternate min values. The only thing you care about is if it NA or not.