Crj-200 captain reported jet blast encounter from a departing aircraft on runway 9 at bos while land...

Narrative:

On very short final to 4L in bos last night; we took a pretty good jet blast jolt from an aircraft departing on 9. It was only momentary; but was a definite slap. That could have been an issue especially with lighter aircraft. We were through it in a second. Trouble I see with this particular issue is split frequencies for tower operations. We did not see this aircraft as lights blended in at night and watching our own operations. First officer said he saw the other aircraft late but wasn't able to say anything until after the fact. Happened pretty quickly. Landed without incident. I find it frustrating to not be able to hear other operations around me due to split frequencies; but I understand the need for their use. I think that maybe a better way to communicate information like departing; landing aircraft in this type of situation would help us all plan. I have noticed a marked increase in wake encounters behind other aircraft on these sids and stars. All goes to thinking about spacing to reduce these issues.

Original NASA ASRS Text

Title: CRJ-200 Captain reported jet blast encounter from a departing aircraft on Runway 9 at BOS while landing on Runway 4. Reporter cited split Tower frequencies as contributing.

Narrative: On very short final to 4L in BOS last night; we took a pretty good jet blast jolt from an aircraft departing on 9. It was only momentary; but was a definite slap. That could have been an issue especially with lighter aircraft. We were through it in a second. Trouble I see with this particular issue is split frequencies for Tower operations. We did not see this aircraft as lights blended in at night and watching our own operations. First Officer said he saw the other aircraft late but wasn't able to say anything until after the fact. Happened pretty quickly. Landed without incident. I find it frustrating to not be able to hear other operations around me due to split frequencies; but I understand the need for their use. I think that maybe a better way to communicate information like departing; landing aircraft in this type of situation would help us all plan. I have noticed a marked increase in wake encounters behind other aircraft on these SIDs and STARs. All goes to thinking about spacing to reduce these issues.

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	1126357
Time
Date	201310
Local Time Of Day	1801-2400
Place
Locale Reference	BOS.Tower
State Reference	MA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Landing
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Inflight Event / Encounter Other / Unknown

Crj-200 captain reported jet blast encounter from a departing aircraft on runway 9 at bos while landing on runway 4. Reporter cited split tower frequencies as contributing.