Small transport crew had altitude deviation.

Attributes
ACN	442920
Time
Date	199907
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bna.airport
State Reference	TN
Altitude	msl bound lower : 3500 msl bound upper : 4000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme.artcc
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 11000 flight time type : 3000
ASRS Report	442920
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance Company
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Well, it happened again! About 10 yrs ago, same scenario. We were cleared from 6000 ft to 4000 ft by ZME. I noticed the altimeter passing through 3500 ft. A new man in the right seat got busy instructing, teaching and showing instead of flying the airplane. We would be wise to not use a new part-timer unless he has been properly trained on the ground!

Original NASA ASRS Text

Title: SMT CREW HAD ALTDEV.

Narrative: WELL, IT HAPPENED AGAIN! ABOUT 10 YRS AGO, SAME SCENARIO. WE WERE CLRED FROM 6000 FT TO 4000 FT BY ZME. I NOTICED THE ALTIMETER PASSING THROUGH 3500 FT. A NEW MAN IN THE R SEAT GOT BUSY INSTRUCTING, TEACHING AND SHOWING INSTEAD OF FLYING THE AIRPLANE. WE WOULD BE WISE TO NOT USE A NEW PART-TIMER UNLESS HE HAS BEEN PROPERLY TRAINED ON THE GND!

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.