An aircraft is trimmed straight and level at true air speed (TAS) of 100 m/s at standard sea level
(SSL). Further, pull of 5 N holds the speed at 90 m/s without re-trimming at SSL (air density = 1.22
kg/m3). To fly at 3000 m altitude (air density = 0.91 kg/m 3) and 120 m/s TAS without re-trimming,
the aircraft needs
(A) 1.95 N upward force. (B) 1.95 N downward force.
(C) 1.85 N upward force. (D) 1.75 N downward force.
Official Answer Key:
0.0
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2012 Q.36)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Structural Mechanics** under *Aerospace Structures* (2 Marks, NAT).
**2. Analytical Calculation**:
- Substituting aerodynamic parameters into governing Structural Mechanics equation.
**3. Final Answer**:
Acceptable official numerical value is **0.0**.
Practice This in Real CBT Exam Interface
Test yourself with the official TCS-iON palette, virtual calculator, and immediate performance analytics.