A description discrepancy between the class B altitude limits on various ord airspace detailed chart...

Narrative:

On departure from mdw westbound at 3000 ft MSL 12 NM south of ord the pilot flying (first officer) began to accelerate past 210 KTS. Pilot monitoring (captain) called check speed and pilot flying questioned the callout as invalid. Pilot monitoring then commanded a speed reduction. Pilot flying complied but stated it was an incorrect callout as he was in class B airspace and was not speed restricted. Almost immediately a climb clearance was issued by ATC. Once at cruise altitude the pilot monitoring showed the pilot flying the commerical chart for chicago; illinois detailed airspace and pointed out the sector they were in showing the number 100 with a line underneath and the number 30 below the line indicating class B airspace was that altitude above 3000 ft and below 10;000 ft. The pilot flying countered by showing the chicago; illinois page which shows the number 30 with a line underneath indicating the class B airspace is that altitude at or above 3000 ft. Both charts show the upper limit as below 10;000 ft. This discrepancy between charts nearly caused a speed deviation below class B airspace. Additionally; the chart shows the sector between 15 and 25 NM with the number 36 with a line below indicating 3600 ft is in class B airspace. A blue note shows mdw class C airspace with the number 36 with the line above indicating 3600 ft is in mdw class C airspace. Thus; in this sector the altitude 3600 ft is in both ord class B and mdw class C.

Original NASA ASRS Text

Title: A description discrepancy between the Class B altitude limits on various ORD airspace detailed charts was discovered between the 10-15 DME arc; both describe that arc's floor at 3;000 FT in different ways.

Narrative: On departure from MDW westbound at 3000 FT MSL 12 NM south of ORD the pilot flying (First Officer) began to accelerate past 210 KTS. Pilot monitoring (Captain) called check speed and pilot flying questioned the callout as invalid. Pilot monitoring then commanded a speed reduction. Pilot flying complied but stated it was an incorrect callout as he was in Class B airspace and was not speed restricted. Almost immediately a climb clearance was issued by ATC. Once at cruise altitude the pilot monitoring showed the pilot flying the Commerical Chart for Chicago; Illinois detailed airspace and pointed out the sector they were in showing the number 100 with a line underneath and the number 30 below the line indicating Class B airspace was that altitude ABOVE 3000 FT and BELOW 10;000 FT. The pilot flying countered by showing the Chicago; Illinois page which shows the number 30 with a line underneath indicating the Class B airspace is that altitude AT or ABOVE 3000 FT. Both charts show the upper limit as BELOW 10;000 FT. This discrepancy between charts nearly caused a speed deviation below Class B airspace. Additionally; the chart shows the sector between 15 and 25 NM with the number 36 with a line below indicating 3600 FT is in Class B airspace. A blue note shows MDW Class C airspace with the number 36 with the line above indicating 3600 FT is in MDW Class C airspace. Thus; in this sector the altitude 3600 FT is in both ORD Class B and MDW Class C.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	860458
Time
Date	200911
Local Time Of Day	0601-1200
Place
Locale Reference	MDW.Airport
State Reference	IL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Experience	Flight Crew Last 90 Days 253 Flight Crew Type 8599
Events
Anomaly	Deviation - Speed All Types

A description discrepancy between the class B altitude limits on various ord airspace detailed charts was discovered between the 10-15 DME arc; both describe that arc's floor at 3;000 ft in different ways.