# AD 87-06-02: Electronic Flight Instrument Systems Symbol Generators - Type: Airworthiness directive - Status: Current - Products: ATR - GIE Avions de Transport R gional ATR42-200, ATR42-300, ATR42-320, ATR42-500, DHC-8-101, DHC-8-102, DHC-8-103, DHC-8-106, DHC-8-201, DHC-8-202, DHC-8-301, DHC-8-311 and 10 more - Effective: May 11, 1987 - Superseded by: Nothing supersedes this AD - Product type: Appliance - Amendment: 39-5610 - Registered aircraft: 408 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D5A084982397495486256A38004936BF.0001 - DRS record last changed: January 21, 2026 - Page: https://openairdocs.org/ad/87-06-02 ## The airworthiness directive 87-06-02 HONEYWELL, INC., SPERRY COMMERCIAL FLIGHT SYSTEMS DIVISION (SPERRY CORPORATION, AEROSPACE AND MARINE GROUP): Amendment 39-5610. Applicable to the following models of Sperry Electronics Flight Instrument Systems (EFIS) Symbol Generators, which have not been modified to Mod Level S or subsequent: MODEL SPERRY PART NUMBER SG-810 7004544-901 SG-811 7004544-811 SG-610 7004544-902 NOTE: These systems are known to be installed in, but not limited to, deHavilland Model DHC-8, British Aerospace Model BAe 125-800, Cessna Model 650, and Aerospatiale Model ATR-42 series airplanes. Compliance is required as indicated, unless previously accomplished. To reduce the possibility of AHRS attitude and heading computations being contaminated, which can result in frozen attitude and heading displays on both instrument panels, accomplish the following: A. Prior to further flight, install a placard adjacent to the first pilot's electronic attitude direction indicator (EADI), in full view of the pilot, stating "FLIGHT INTO KNOWN IMC PROHIBITED." B. Modification of the Sperry EFIS Symbol Generator models listed above to Mod Level S or subsequent, or installation of the following Sperry EFIS Symbol Generator models, constitutes terminating action of the operational and placard requirements of paragraph A., above: MODEL SPERRY PART NUMBERS MOD LEVEL (OR SUBSEQUENT) SG-811 7004544-211 V SG-811 7004544-311 AD SG-811 7004544-411 U SG-611 7004544-611 S All persons affected by this directive who have not already received the appropriate service documents from the manufacturer, may obtain copies upon request to Honeywell Inc., Sperry Commercial Flight Systems Division (formerly Sperry Corporation, Aerospace and Marine Group), P.O. Box 29000, Phoenix, Arizona 85038-9000. These documents may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Western Aircraft Certification Office, 15000 Aviation Boulevard, Hawthorne, California. This Amendment becomes effective May 11, 1987, as to all persons, except those persons to whom it was made immediately effective by Priority Letter AD 87-06-02, issued March 13, 1987. ## Affected data sheets (4) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A13NM](https://openairdocs.org/tcds/A13NM): De Havilland Aircraft of Canada Limited; names 12 of 16 models: DHC-8-101, DHC-8-102, DHC-8-103, DHC-8-106, DHC-8-201, DHC-8-202, DHC-8-301, DHC-8-311… - [TCDS A53EU](https://openairdocs.org/tcds/A53EU): ATR – GIE Avions de Transport Régional; names 4 of 11 models: ATR42-300, ATR42-320, ATR42-200, ATR42-500 - [TCDS A3EU](https://openairdocs.org/tcds/A3EU): Textron Aviation Inc.; names 2 of 50 models: BAe.125 Series 800A (U-125), BAe.125 Series 800B - [TCDS A9NM](https://openairdocs.org/tcds/A9NM): Textron Aviation Inc.; names 1 of 1 models: 650 ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 408 (408 by airframe model, 0 by engine model) - Makers: Cessna 201, British Aerospace 66, Bombardier 57, Dehavilland 28, Aerospatiale/Aeritalia 16, Corporate Jets 8, Raytheon Corporate Jets 8, Atr-Gie Avions De Trnsp Region 6, Boeing Of Canada/Dehav Div 6, Aerospatiale/Alenia 3 Models with the most aircraft: - [Cessna 650](https://openairdocs.org/model/cessna-650): 201 aircraft (airframe model) - [British Aerospace BAE 125 SERIES 800A](https://openairdocs.org/model/british-aerospace-bae-125-series-800a): 61 aircraft (airframe model) - [Bombardier DHC-8-402](https://openairdocs.org/model/bombardier-dhc-8-402): 26 aircraft (airframe model) - [Dehavilland DHC-8-202](https://openairdocs.org/model/dehavilland-dhc-8-202): 17 aircraft (airframe model) - [Bombardier DHC-8-315](https://openairdocs.org/model/bombardier-dhc-8-315): 15 aircraft (airframe model) - [Bombardier DHC-8-202](https://openairdocs.org/model/bombardier-dhc-8-202): 14 aircraft (airframe model) - [Aerospatiale/Aeritalia ATR 42-300](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-300): 12 aircraft (airframe model) - [Corporate Jets BAE 125-800A](https://openairdocs.org/model/corporate-jets-bae-125-800a): 8 aircraft (airframe model) - [Raytheon Corporate Jets BAE 125-800A](https://openairdocs.org/model/raytheon-corporate-jets-bae-125-800a): 8 aircraft (airframe model) - [Atr-Gie Avions De Trnsp Region ATR42-500](https://openairdocs.org/model/atr-gie-avions-de-trnsp-region-atr42-500): 6 aircraft (airframe model) - [British Aerospace BAE 125-800A](https://openairdocs.org/model/british-aerospace-bae-125-800a): 5 aircraft (airframe model) - [Dehavilland DHC-8-106](https://openairdocs.org/model/dehavilland-dhc-8-106): 4 aircraft (airframe model) - [Aerospatiale/Aeritalia ATR 42-320](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-320): 4 aircraft (airframe model) - [Boeing DHC-8-102](https://openairdocs.org/model/boeing-dhc-8-102): 3 aircraft (airframe model) - [Boeing Of Canada/Dehav Div DHC-8-311](https://openairdocs.org/model/boeing-of-canada-dehav-div-dhc-8-311): 3 aircraft (airframe model) - [Boeing Of Canada/Dehav Div DHC-8-106](https://openairdocs.org/model/boeing-of-canada-dehav-div-dhc-8-106): 2 aircraft (airframe model) - [Bombardier DHC-8-201](https://openairdocs.org/model/bombardier-dhc-8-201): 2 aircraft (airframe model) - [Dehavilland DHC-8-201](https://openairdocs.org/model/dehavilland-dhc-8-201): 2 aircraft (airframe model) - [Dehavilland DHC-8-103](https://openairdocs.org/model/dehavilland-dhc-8-103): 2 aircraft (airframe model) - [Dehavilland DHC-8-315](https://openairdocs.org/model/dehavilland-dhc-8-315): 2 aircraft (airframe model) All 30 models: https://openairdocs.org/ad/87-06-02/models.md Every aircraft: https://openairdocs.org/ad/87-06-02/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.