Complaint about cross reference of items in commuter light transport MEL.

Attributes
ACN	83610
Time
Date	198803
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12200 flight time type : 60
ASRS Report	83610
Person 2
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Chart Or Publication
Air Traffic Incident	other
Situations
Publication	Unspecified

Narrative:

Reference mmel 21-1-3 that refer to a bleed air fail annunciator light of the light transport (with first officer artificial horizon air driven) and allows deferral with bleed switch in instrument and environmental off the values secured in closed position. Then thumbing through the MEL to 27-1 reference instrument air valves/sources and only VMC day allowed with one inoperative makes you illegal where you are (IMC) and yet they are not cross-referenced for air driven gyro installations. Recommend referencing VMC only, day only, etc to all MEL conditions where it is limiting.

Original NASA ASRS Text

Title: COMPLAINT ABOUT CROSS REFERENCE OF ITEMS IN COMMUTER LTT MEL.

Narrative: REFERENCE MMEL 21-1-3 THAT REFER TO A BLEED AIR FAIL ANNUNCIATOR LIGHT OF THE LTT (WITH F/O ARTIFICIAL HORIZON AIR DRIVEN) AND ALLOWS DEFERRAL WITH BLEED SWITCH IN INSTRUMENT AND ENVIRONMENTAL OFF THE VALUES SECURED IN CLOSED POSITION. THEN THUMBING THROUGH THE MEL TO 27-1 REFERENCE INSTRUMENT AIR VALVES/SOURCES AND ONLY VMC DAY ALLOWED WITH ONE INOP MAKES YOU ILLEGAL WHERE YOU ARE (IMC) AND YET THEY ARE NOT CROSS-REFERENCED FOR AIR DRIVEN GYRO INSTALLATIONS. RECOMMEND REFERENCING VMC ONLY, DAY ONLY, ETC TO ALL MEL CONDITIONS WHERE IT IS LIMITING.

Data retrieved from NASA's ASRS site as of August 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.