T/O mins `121
#11
Originally Posted by buffalopilot
So if the t/o mins on the plate are greater than what the op specs are, you follow the specs right?
say the departure says t/o mins are 800RVR and ops specs say 600RVR which one do you follow?
say the departure says t/o mins are 800RVR and ops specs say 600RVR which one do you follow?
#12
Line Holder
Joined APC: Apr 2005
Position: B737 F/O
Posts: 78
Your operations specifications authorizes you to conduct an operation. In this case it is 500 RVR. However, you cannot operate below a visibility that is published on a chart.
If a published take-off minimum is greater than standard take-off minimums then you cannot depart below the published minimums.
If a published take-off minimum is greater than standard take-off minimums then you cannot depart below the published minimums.
#13
Gets Weekends Off
Joined APC: Sep 2005
Position: midsize
Posts: 242
Originally Posted by buffalopilot
So if the t/o mins on the plate are greater than what the op specs are, you follow the specs right?
say the departure says t/o mins are 800RVR and ops specs say 600RVR which one do you follow?
say the departure says t/o mins are 800RVR and ops specs say 600RVR which one do you follow?
#14
Originally Posted by Calpilot
. There are no airports in the US that allow for a take-off less than 600 RVR ...
FAA Approved
OpSpec: For visibility less than 600 RVR down to 300 RVR with 3
transmissometers installed, observe the following restrictions.
All the following visual aids must be available:
- Operative high intensity runway lights (HIRL),
- Operative runway centerline lights (CL), and
- Runway centerline markings (RCLM).
If all three transmissometers are operating, they are all controlling and
must be at or above 300 RVR.
If any two of the three transmissometers are operative, takeoff is
permitted if the two operative transmissometers are reporting 300
RVR or above.
Less than 600 RVR takeoff must be specifically authorized on the
Jeppesen -9A page (10-9A or equivalent).
Use HGS takeoff procedures.
The following aircraft equipment must be used:
- The HGS system
- Both Pilots’ ILS receivers
The CA must be HGS trained, qualified, and current.
The FO must be HGS trained.
The maximum crosswind is limited to 10 knots, and the maximum
headwind is limited to 25 knots.
Last edited by SWAcapt; 02-28-2006 at 05:55 PM.
#16
121.617 Alternate airport for departure.
(a) If the weather conditions at the airport of takeoff are below the landing minimums in the certificate holder's operations specifications for that airport, no person may dispatch or release an aircraft from that airport unless the dispatch or flight release specifies an alternate airport located within the following distances from the airport of takeoff:
(1) Aircraft having two engines. Not more than one hour from the departure airport at normal cruising speed in still air with one engine inoperative.
(2) Aircraft having three or more engines. Not more than two hours from the departure airport at normal cruising speed in still air with one engine inoperative.
(b) For the purpose of paragraph (a) of this section, the alternate airport weather conditions must meet the requirements of the certificate holder's operations specifications.
(c) No person may dispatch or release an aircraft from an airport unless he lists each required alternate airport in the dispatch or flight release.
#19
Gets Weekends Off
Joined APC: Feb 2006
Position: DD->DH->RU/XE soon to be EV
Posts: 3,732
The 3 separate FOM's I have worked under say that ALL alternates must comply with the same criteria.
Also, most 121 operators use a different method to determine alternate minimums. It's OP SPEC c55. Some call it method 1/method 2.
Has to deal with how many navaids/usable approaches at the alternate, etc. One says that if there are TWO approaches to add 200 ft and a 1/2 mile to both, the other says to add 400 ft and 1 mile if only using 1 approach.
The LOWEST you could ever go would be 400/1 using the method where you add 200ft and 1/2 mile, assuming you had 2 separate usable approaches that had the same published mins.
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