A B737 crew flying the bwi runway 10 ILS descended to 1;500' inside colum on the localizer as per th...

Narrative:

We were being vectored from the south at 2000' MSL to intercept the localizer course for bwi runway 10 ILS. Ceilings were ragged between about 1700'- 2000'. We were told to maintain 2000' until localizer intercept then cleared for the ILS. It looked to me as though we would intercept at colum which shows 2500' on the approach chart. The runway 10 ILS has no DME; I relied on the CDU to indicate that we had passed colum. As we got VOR/localizer I descended to 1500' to intercept GS at jeans. Right as we got to 1500' we got an altitude alert from approach. I don't recall the exact verbiage; but it was something like; 'company # minimum MDA is 2000'.' since we were approaching the FAF; we stayed at 1500' and intercepted the G/south. That was the only fallout that we received. Landed normally and taxied to the gate.

Original NASA ASRS Text

Title: A B737 crew flying the BWI Runway 10 ILS descended to 1;500' inside COLUM on the localizer as per the ILS approach chart but were to told by PCT the minimum MDA altitude 2;000'. The crew could not find the basis for that statement.

Narrative: We were being vectored from the south at 2000' MSL to intercept the LOC course for BWI Runway 10 ILS. Ceilings were ragged between about 1700'- 2000'. We were told to maintain 2000' until LOC intercept then cleared for the ILS. It looked to me as though we would intercept at COLUM which shows 2500' on the approach chart. The Runway 10 ILS has no DME; I relied on the CDU to indicate that we had passed COLUM. As we got VOR/LOC I descended to 1500' to intercept GS at JEANS. Right as we got to 1500' we got an altitude alert from Approach. I don't recall the exact verbiage; but it was something like; 'Company # minimum MDA is 2000'.' Since we were approaching the FAF; we stayed at 1500' and intercepted the G/S. That was the only fallout that we received. Landed normally and taxied to the gate.

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.

Attributes
ACN	1367119
Time
Date	201606
Local Time Of Day	1801-2400
Place
Locale Reference	BWI.Airport
State Reference	MD
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer
Events
Anomaly	ATC Issue All Types Inflight Event / Encounter Weather / Turbulence

A B737 crew flying the bwi runway 10 ILS descended to 1;500' inside colum on the localizer as per the ILS approach chart but were to told by pct the minimum MDA altitude 2;000'. The crew could not find the basis for that statement.