Follow SID altitude constraints UK

[bursco 14]

Flying from Cardiff (EGFF) to Dublin (EIDW) - flt plan from vroute with BCN as first waypoint in plan.

Enter the SID for BCN dep as BCN1A -rwy30 - with altitude constraints as attached pic. All the constraints are in the FPL when SID is entered.

Have set up Nav source,pressed nav etc but it will not fly the altitude constraints - anyone one can do a noob run thro the FMC to make the Dash fly the constraints. I use alt 18000 and it just climbs straight up to that.

Googled but to no avail.

Thanks

Denis

 

[Andydigital 93]

VNAV only works in descents, this is most definitely not a conventional FMS like a Boeing has for example, it does not work in a climb, its up to the pilot to enter altitude constraints manually with the altitude selector and then press ALT SEL to make the AP level of at the commanded ALT. You really do need to read the full manual and run through the tutorials.

[bursco 14]

Thanks for reply Andy - read read read and follow tutorial. B)  :rolleyes:  :(

 

Denis

[hopskip 253]

All of the above restrictions (apart from the "Maintain 6000ft" one) are all "Cross this place at or above X feet". So to do this you would select 6000ft on the MCP before entering the runway. Then once airborne get the gear up, flaps up on schedule, and climb as fast as it can go.

 

If you pass 19.1 DME from BCN while still below 2300ft, tell ATC cos you're not climbing fast enough.

 

If you pass 19.1DME from BCN at 6000ft then just stay at 6000ft till you pass 6.0DME from BCN.

 

After passing 6.0DME start climbing again if you have been cleared to do so.

 

Stay at 6000ft till 6.0DME from BCN unless ATC has specifically waived the restriction.

 

2300ft underlined means you must pass that waypoint ABOVE that altitude.

 

_____

6000ft means you need to pass that waypoint AT that altitude. (not above or below). The MCP Altitude Select mode will achieve this. even with nothing in the FMS.

 

While 2300ft technically means you can pass that waypoint anywhere from 2301ft up to and/or past the altitude of the moon, the 6000ft restriction means you will need to be at 6000ft (not above or below) at a later point in the climb, so there's no point in climbing to FL250 and then decending to make the 6000ft restriction.

 

The 2300ft (2300ft or above) restriction is usually there to protect a 500ft buffer between your flightpath and class G airspace where VFR traffic might be. In this case 1800ft So if you were at 1800ft you might find yourself amongst some sightseeing or flight training Cessnas who aren't talking to Air Traffic Controll because they are in Class G.

 

Procedure:

1. Before starting engines, select 6000ft on your MCP altitude selection knob on the glareshield.
2. Start up and start taxying
3. Select "Altitude Select" on the MCP so you don't pass 6000ft on climb
4. Get clearance for takeoff
5. Take off, retract gear and flap
6. Set climb power and RPM.
7. follow Flight Director or engage autopilot
8. monitor flightpath, check that you pass above each of the altitude restrictions on your way up to 6000ft
9. arrive at, and level off at 6000ft before 6.0DME from BCN
10. Adjust power to maintain below 240kts in level flight at 6000ft.
11. After passing 6.0DME from BCN (inbound) select your next climb step (or cruise altitude) and start climbing again in IAS or V/S modes

VNAV is only for decent.

[bursco 14]

Thanks hopskip that explained things about the constraints I did'nt know and for the explanation.

 

Denis