B757 flight crew reported that they were issued vectors that would take them outside the class B air...

Attributes
ACN	1690744
Time
Date	201910
Local Time Of Day	1201-1800
Place
Locale Reference	MCO.TRACON
State Reference	FL
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 144 Flight Crew Total 5404 Flight Crew Type 2157
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 182 Flight Crew Total 8742 Flight Crew Type 5619
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

Class B airspace is from ground to 10;000 ft. With caveats to altitude and distance based off of the VOR. We were given an ATC clearance to descend from 6;000 ft. To 1;600 ft. While on the downwind leg of the RNAV arrival. An RNAV arrival waypoint takes you out of class B airspace at 1;600 ft. If a turn towards final approach is not completed before 20 DME based off of the VOR. We had descended to no lower than 2;700 ft. Just passed 20 DME off of the VOR when ATC gave us an approximate turn to final of heading 270 degrees. Almost simultaneously it appeared that ATC realized the mistake in the clearance given and stated (paraphrasing); 'you will exist class B airspace and will re-enter class B airspace inbound on approach to final inside of 20 DME off of the.'additionally; and almost simultaneously; we realized the ATC clearance to descend and maintain 1;600 ft. Would put us out of class B airspace if an ATC clearance to turn toward final was not obtained prior to extending past 20 DME off of the VOR at which time we requested to climb back to 3;000 ft. Again as not to go below class B airspace. In the end; again we ended up descending to no lower than 2;700 ft. Just outside of the 20 DME. You could tell in the controller's voice that they understood they had made a mistake so when we requested to climb back to 3;000 ft. To join final approach to runway 35R the clearance was immediately granted. The remainder of the approach to final and landing on runway 35R was uneventful.this is a classic setup for a class B airspace bust based on ATC controller clearance; and/or if the operating pilots are not aware of the class B airspace altitude and distance restrictions.

Original NASA ASRS Text

Title: B757 flight crew reported that they were issued vectors that would take them outside the Class B airspace and resulted in them deviating from their assigned altitude.

Narrative: Class B airspace is from Ground to 10;000 ft. with caveats to altitude and distance based off of the VOR. We were given an ATC clearance to descend from 6;000 ft. to 1;600 ft. while on the downwind leg of the RNAV arrival. An RNAV arrival waypoint takes you out of Class B airspace at 1;600 ft. if a turn towards final approach is not completed before 20 DME based off of the VOR. We had descended to no lower than 2;700 ft. just passed 20 DME off of the VOR when ATC gave us an approximate turn to final of heading 270 degrees. Almost simultaneously it appeared that ATC realized the mistake in the clearance given and stated (paraphrasing); 'You will exist Class B airspace and will re-enter Class B airspace inbound on approach to final inside of 20 DME off of the.'Additionally; and almost simultaneously; we realized the ATC clearance to descend and maintain 1;600 ft. would put us out of Class B airspace if an ATC clearance to turn toward final was not obtained prior to extending past 20 DME off of the VOR at which time we requested to climb back to 3;000 ft. again as NOT to go below Class B airspace. In the end; again we ended up descending to no lower than 2;700 ft. just outside of the 20 DME. You could tell in the Controller's voice that they understood they had made a mistake so when we requested to climb back to 3;000 ft. to join final approach to Runway 35R the clearance was immediately granted. The remainder of the approach to final and landing on Runway 35R was uneventful.This is a classic setup for a Class B airspace bust based on ATC Controller clearance; and/or if the operating pilots are not aware of the Class B airspace altitude and distance restrictions.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B757 flight crew reported that they were issued vectors that would take them outside the class B airspace and resulted in them deviating from their assigned altitude.