A BE56 pilot approaching tbm on an ILS breaks off of the ILS because of thunderstorm on final and descends below approach altitude to remain clear of WX.

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Attributes
ACN	671018
Time
Date	200509
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : lal.vortac
State Reference	FL
Altitude	msl single value : 5000
Environment
Flight Conditions	IMC
Weather Elements	Rain Turbulence Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Operator	general aviation : personal
Make Model Name	Beechcraft Twin Turboprop Jet Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Route In Use	enroute airway : v159.airway
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 82 flight time total : 9900 flight time type : 500
ASRS Report	671018
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Supplementary
Problem Areas	Weather
Primary Problem	Weather

Narrative:

While en route tmb after departure bhm I encountered isolated thunderstorms over or near lal VOR. I was on an IFR pilot plan when I was cleared from 13000 ft MSL to 5000 ft MSL in preparation for arrival at tmb. ATIS stated 2500 ft sct; 5000 ft sct; 25000 ft ovc; 7MI in rain. There was a cumulonimbus buildup directly in from of me. It looked benign. As I approached within a mile of this buildup several bolts of lightning emanated from this cloud. I called ATC as I deviated to the right and descended to 2000 ft MSL in VMC. ATC then; once the cell was cleared; gave us vectors to be back on course and back to 5000 ft MSL. I complied. The ILS was accomplished at tmb in rain with no further need to divert due the thunderstorms. ATC handled the diversion well.

Original NASA ASRS Text

Title: A BE56 PLT APCHING TBM ON AN ILS BREAKS OFF OF THE ILS BECAUSE OF TSTM ON FINAL AND DSNDS BELOW APCH ALT TO REMAIN CLR OF WX.

Narrative: WHILE ENRTE TMB AFTER DEP BHM I ENCOUNTERED ISOLATED THUNDERSTORMS OVER OR NEAR LAL VOR. I WAS ON AN IFR PLT PLAN WHEN I WAS CLRED FROM 13000 FT MSL TO 5000 FT MSL IN PREPARATION FOR ARR AT TMB. ATIS STATED 2500 FT SCT; 5000 FT SCT; 25000 FT OVC; 7MI IN RAIN. THERE WAS A CUMULONIMBUS BUILDUP DIRECTLY IN FROM OF ME. IT LOOKED BENIGN. AS I APCHED WITHIN A MILE OF THIS BUILDUP SEVERAL BOLTS OF LIGHTNING EMANATED FROM THIS CLOUD. I CALLED ATC AS I DEVIATED TO THE R AND DSNDED TO 2000 FT MSL IN VMC. ATC THEN; ONCE THE CELL WAS CLRED; GAVE US VECTORS TO BE BACK ON COURSE AND BACK TO 5000 FT MSL. I COMPLIED. THE ILS WAS ACCOMPLISHED AT TMB IN RAIN WITH NO FURTHER NEED TO DIVERT DUE THE THUNDERSTORMS. ATC HANDLED THE DIVERSION WELL.

Data retrieved from NASA's ASRS site as of January 2009 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.