The flight crew of a B737-700 encountered an unexpected route discontinuity between buoyy and bsque ...

Narrative:

Shortly after takeoff on runway 4R at bos on the blzzr 1 RNAV departure; we received a route discontinuity between buoyy and bsque. Three attempts were made to close the discontinuity before it closed. We remained on the LNAV course throughout departure. Preflight route/departure briefing verified all correct points for procedure; and no discontinuities existed. There is a safety alert in our chart manuals; along with a note on the cover page of the trip weather package; drawing attention to route discontinuities occurring from runways 15R and 22L/right between points brrro and chwdh and a warning to not accept these procedures with a discontinuity. The purpose of this report is to alert flight operations that this anomaly is occurring on other runways not included in the safety alert or weather package cover note. Dispatch was contacted once we got to cruise altitude to pass this information along to flight crews departing bos. My chief pilot and union safety representative were also given a courtesy call to inform them of the issue.I believe the company should suspend RNAV departures out of bos until the cause for these discontinuities is discovered.

Original NASA ASRS Text

Title: The flight crew of a B737-700 encountered an unexpected route discontinuity between BUOYY and BSQUE on the line selected BLZZR RNAV SID off Runway 4R at BOS.

Narrative: Shortly after takeoff on Runway 4R at BOS on the BLZZR 1 RNAV Departure; we received a route discontinuity between BUOYY and BSQUE. Three attempts were made to close the discontinuity before it closed. We remained on the LNAV course throughout departure. Preflight route/departure briefing verified all correct points for procedure; and no discontinuities existed. There is a Safety Alert in our chart manuals; along with a note on the cover page of the trip weather package; drawing attention to route discontinuities occurring from Runways 15R and 22L/R between points BRRRO and CHWDH and a warning to not accept these procedures with a discontinuity. The purpose of this report is to alert Flight Operations that this anomaly is occurring on other runways not included in the Safety Alert or weather package cover note. Dispatch was contacted once we got to cruise altitude to pass this information along to flight crews departing BOS. My Chief Pilot and Union Safety Representative were also given a courtesy call to inform them of the issue.I believe the company should suspend RNAV departures out of BOS until the cause for these discontinuities is discovered.

Data retrieved from NASA's ASRS site as of July 2013 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	1047859
Time
Date	201212
Local Time Of Day	0601-1200
Place
Locale Reference	BOS.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Dawn
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID BLZZR 1
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 160
Person 2
Function	First Officer
Experience	Flight Crew Last 90 Days 106
Events
Anomaly	Aircraft Equipment Problem Critical

The flight crew of a B737-700 encountered an unexpected route discontinuity between buoyy and bsque on the line selected blzzr RNAV SID off runway 4R at bos.