Medium large transport taxiing to gate has near collision with taxiing small transport.

Attributes
ACN	186252
Time
Date	199108
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground other : taxi
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 7170 flight time type : 2500
ASRS Report	186252
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : ground critical conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 30 vertical : 0
Supplementary
Primary Problem	ATC Human Performance

Narrative:

Landed runway 4R bos. Switched from tower 119.1 to tower 128.8 as requested by 119.1, then crossed 4L with clearance. Contacted ground 121.9 on north taxiway. Cleared to gate by ground via 'north inner', crossed 15R, aircraft in position on runway 15R. Immediately after crossing runway 15R, captain made maximum effort stop to avoid hitting a commuter small transport Y which was taxiing on inner into our path. Captain verified our clearance with ground. Airport was in chaos at the time with runway change.

Original NASA ASRS Text

Title: MLG TAXIING TO GATE HAS NEAR COLLISION WITH TAXIING SMT.

Narrative: LANDED RWY 4R BOS. SWITCHED FROM TWR 119.1 TO TWR 128.8 AS REQUESTED BY 119.1, THEN CROSSED 4L WITH CLRNC. CONTACTED GND 121.9 ON N TAXIWAY. CLRED TO GATE BY GND VIA 'N INNER', CROSSED 15R, ACFT IN POS ON RWY 15R. IMMEDIATELY AFTER XING RWY 15R, CAPT MADE MAX EFFORT STOP TO AVOID HITTING A COMMUTER SMT Y WHICH WAS TAXIING ON INNER INTO OUR PATH. CAPT VERIFIED OUR CLRNC WITH GND. ARPT WAS IN CHAOS AT THE TIME WITH RWY CHANGE.

Data retrieved from NASA's ASRS site as of July 2007 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.